Idiom
Backlog
What does 'backlog' mean?
'Backlog' means a large amount of unfinished work that has accumulated and still needs processing. The office developed a backlog of applications after staff shortages. Use 'backlog of' to name the items, and say 'tackle', 'reduce', or 'clear a backlog'—not 'clean a backlog'. A single delayed task is not a backlog.
Key points
- A backlog is an accumulated collection, not one delayed task.
- Use 'a backlog of' before the specific items.
- Teams tackle, reduce, or clear a backlog.
- 'Backlog' usually describes operational pressure and delay.
Can you use "Backlog" yourself?
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Stage 1 of 5
Understand
What it means, when to use it, and mistakes to avoid.
Watch & learn
Backlog: meaning and listening practice
Learn Backlog with Bella, then practise with British and American conversations, speaking time and common questions. B2 English.
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The full explanation
A backlog is a substantial quantity of work, cases, or orders that has accumulated over time and remains unprocessed. It does not describe a single delayed chore; it describes a collection of pending duties that have gathered into an ongoing burden.
Our clinic hired two evening clerks to clear the backlog of appointment requests.
Why it works: The verb 'clear' shows that the staff processed all the waiting requests until none remained.
2 more examples
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The customer support desk faces a heavy backlog of technical tickets following the system update.
'A heavy backlog of' specifies both the scale of the accumulation and the exact items waiting.
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We must tackle the backlog of loan applications before accepting new submissions next week.
'Tackle' indicates taking decisive action to start resolving the piled-up applications.
Read the full guide
Decide If Work Has Accumulated or Just Delayed
Before using the noun backlog, determine whether you are describing one late task or an entire pile of unfinished business. English speakers do not use backlog for an overdue personal report or a single delayed email. The word specifically marks an accumulation of multiple cases, orders, or tickets that arrived faster than people could finish them. If a factory has five hundred unfulfilled orders waiting in its queue, that queue is a backlog because the volume creates an operational delay.
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The warehouse developed a backlog of orders after the main sorting belt broke.
Why it works: Multiple orders piled up during the mechanical failure, creating an accumulated queue.
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I have an overdue report to finish before five o'clock.
Why it works: A single overdue task is called an overdue assignment or report, not a backlog.
Your turn
Which situation is best described as a backlog?
Answer: A stack of seventy unreviewed job applications from last week
Show the answer
Answer: A stack of seventy unreviewed job applications from last week
A backlog requires an accumulated accumulation of multiple pending items or tasks, not an isolated late meeting or single bug fix.
Connect Backlog to Items Using the Preposition Of
When you want to identify what kind of work has gathered, link backlog directly to the plural noun using the preposition of. Language learners sometimes reach for from or for under the influence of other languages, but those choices sound unnatural in workplace discussions. Say a backlog of repairs, a backlog of claims, or a backlog of messages. This prepositional pattern clarifies the exact contents of the pile without needing awkward descriptive clauses.
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The regional passport office manages a backlog of renewal forms every summer.
Why it works: The phrase 'backlog of renewal forms' accurately links the accumulation to the specific document type.
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Our accounting team resolved the backlog of unpaid bills yesterday afternoon.
Why it works: 'Backlog of unpaid bills' points directly to the pending financial documents.
This also comes up in Catch up and Up to speed.
Your turn
Which phrase correctly describes accumulated travel insurance submissions?
Answer: A backlog of travel claims
Show the answer
Answer: A backlog of travel claims
English standardly uses the preposition 'of' after backlog to identify the specific items that have accumulated.
Select Verbs That Explain How the Pile Formed
Describing how an accumulation started requires precise causative verbs. You can say that an event created a backlog, caused a backlog, or led to a backlog when external trouble stopped normal operations. When the pile grew gradually because incoming volume simply exceeded daily capacity, use the phrasal verb build up or say that a backlog accumulated over time. Selecting the right verb explains whether the delay stems from an acute crisis or chronic understaffing.
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The rail strike created an unexpected backlog of freight shipments across the country.
Why it works: 'Created' shows that a distinct disruption triggered the sudden accumulation.
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A huge backlog of emails built up while our lead specialist was away on leave.
Why it works: 'Built up' describes the gradual growth of unread messages during an absence.
Your turn
Choose the sentence that naturally explains the origin of an accumulated workload.
Answer: The unexpected server crash created a backlog of customer queries.
Show the answer
Answer: The unexpected server crash created a backlog of customer queries.
Verbs like 'created', 'caused', or 'resulted in' naturally combine with backlog to describe the cause of an accumulation.
Distinguish Tackling, Reducing, and Clearing Work
Different verbs mark distinct stages of solving accumulated work. When you begin addressing the pile with energy, say you tackle the backlog or work through it. As your colleagues process files and the remaining volume shrinks, you reduce the backlog. Finally, when every single waiting item has been evaluated and no delayed files remain, you clear the backlog. Notice that English speakers say clear the backlog, never clean the backlog, because clear denotes opening a blocked channel.
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Three temporary paralegals helped our firm clear the backlog of discovery files.
Why it works: 'Clear' indicates that the team finished every pending file until zero remained.
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We plan to tackle the backlog by assigning two hours each morning to pending cases.
Why it works: 'Tackle' emphasizes attacking the accumulation directly and starting deliberate action.
Your turn
What verb should you use if your team wants to state that they processed every single waiting ticket?
Answer: Clear the backlog
Show the answer
Answer: Clear the backlog
The idiomatic professional phrase for finishing all accumulated work is 'clear the backlog'.
Choose Between Backlog and Pending Work
The adjective pending simply indicates that something awaits an outcome, official decision, or signature. A single contract waiting for a legal signature is pending, but it is not a backlog. Backlog implies two operational factors: plural volume and delay caused by constrained capacity. If you tell your supervisor that you have pending tasks, they will assume normal workflow. If you state that you have a backlog, you communicate that you are falling behind your processing rate.
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I have three pending reviews on my schedule today, which is my normal daily quota.
Why it works: 'Pending' describes scheduled items in normal flow without implying an overdue accumulation.
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Because our scanner failed, we now face a backlog of thirty paper forms.
Why it works: 'Backlog' emphasizes that forms have accumulated beyond the normal processing capacity.
Your turn
Why would a project manager say 'we have a backlog' instead of 'we have pending files'?
Answer: To show that tasks have accumulated beyond capacity and are overdue
Show the answer
Answer: To show that tasks have accumulated beyond capacity and are overdue
'Backlog' highlights an abnormal pile of overdue items, whereas 'pending' simply means awaiting completion in regular workflow.
Treat Backlog as a Singular Countable Noun
Learners frequently make two grammatical errors with backlog: pluralizing the noun incorrectly or dropping the indefinite article. Even when a backlog consists of thousands of separate parts or inquiries, the accumulation itself is regarded as one single pile. Therefore, say a backlog exists or there is a backlog, rather than using plural agreement. Only write backlogs if you are comparing distinct accumulations across multiple separate regional offices, departments, or companies.
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There is a sizable backlog of maintenance requests in the east residential building.
Why it works: The singular verb 'is' matches the singular noun phrase 'a sizable backlog'.
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Both shipping depots reported separate backlogs after the snowstorm shut highways.
Why it works: The plural form 'backlogs' is appropriate because two distinct operational queues are being compared.
Your turn
Which sentence demonstrates accurate singular noun and article usage?
Answer: The clinic is struggling with a backlog of patient charts from this morning.
Show the answer
Answer: The clinic is struggling with a backlog of patient charts from this morning.
When referring to a single accumulated collection of files, use the singular noun with the article 'a'.
Recognize Backlog in Connected Speech
In spoken conversations, the word backlog carries its primary stress firmly on the first syllable: BACK-log. The vowel in back is an open front vowel, while log ends in a voiced velar stop. In fluent speech, speakers frequently link the final sound of backlog directly to a following vowel, especially the preposition of. You will hear back-lo-gov rather than two detached words. Recognizing this smooth linking helps you distinguish the phrase during fast phone updates.
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Can you help me clear this backlog of invoices before noon?
Why it works: In fluent delivery, the final /g/ of 'backlog' links into 'of', sounding like 'back-lo-gov'.
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Our chief mechanic noticed the backlog as soon as he opened the work order log.
Why it works: 'Backlog' receives heavy stress on the first syllable, contrasting with the lighter unstressed syllables around it.
Your turn
Where does the primary stress fall when pronouncing the word backlog?
Answer: On the first syllable: BACK-log
Show the answer
Answer: On the first syllable: BACK-log
'Backlog' is a compound noun with initial primary stress: BACK-log.
Report Accumulated Work in Professional Updates
Using backlog in professional status reports conveys competence because it pairs a realistic assessment of delays with clear remediation steps. When drafting an email to leadership or clients, never mention a backlog without outlining an action plan. Combine backlog with measurable numbers and a strong resolution verb like reduce or clear. This structure assures the reader that management understands the bottleneck and has allocated sufficient resources to eliminate the delay.
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We added three contractors this week to reduce our backlog of unverified claims by half.
Why it works: The update combines the noun 'backlog' with a concrete action and a measurable target.
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To prevent a backlog of shipment inquiries, our department set up an automated tracking portal.
Why it works: The sentence explains proactive measures taken to avoid building up an unmanageable queue.
Your turn
Which status report sentence sounds most constructive and professional?
Answer: We brought in weekend staff to clear the backlog of unresolved customer tickets.
Show the answer
Answer: We brought in weekend staff to clear the backlog of unresolved customer tickets.
Professional workplace updates pair the presence of a backlog with constructive corrective action and idiomatic phrasing like 'clear the backlog'.
Other meanings of "backlog"
This lesson practises one meaning. You may also hear these.
A prioritised list of planned work in software development
The product owner updated the sprint backlog.
Common mistakes with "backlog"
What learners often say, what to say instead, and why.
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Not this:
The team will clean the backlog of requests.Say: The team will clear the backlog of requests.
The standard collocation is 'clear a backlog', meaning process all the accumulated items.
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Not this:
We have a backlog from unpaid claims.Say: We have a backlog of unpaid claims.
Use the preposition 'of' to identify the items that have accumulated.
-
Not this:
There are a backlog of repair orders.Say: There is a backlog of repair orders.
'Backlog' is singular when one accumulated collection is meant, so it takes 'is'.
-
Not this:
The office has one backlogs of forms.Say: The office has one backlog of forms.
A single accumulation uses the singular noun 'backlog', not 'backlogs'.
Use it naturally
How people really use “backlog”
Neutral Fine almost anywhere, at work or with friends.
Words it often goes with
- clear the backlogWe hired an extra assistant to clear the backlog before Friday.
- tackle the backlogLet's tackle the backlog by dealing with the oldest requests first.
- a growing backlogThe repair shop has a growing backlog of broken bicycles.
- a backlog of ordersThe bakery has a backlog of orders after a busy holiday weekend.
What people also say
- “We have a backlog of requests.” instead of “We have many requests accumulated and not finished.”Use backlog of to name the work that has piled up.
A stronger way to say it
We have some unfinished work. → We have a growing backlog of unfinished work.
We have a growing backlog of unfinished work because new tasks keep arriving.
Questions about "Backlog"
What is the exact difference between pending work and a backlog?
Pending work simply refers to any task awaiting action, whether it is one document or several routine steps in normal progress. A backlog specifically means an accumulated volume of overdue items that gathered because demand or input exceeded processing capacity over time.
I have two pending contracts on my desk that require routine legal sign-off.
The legal department faces a heavy backlog of contracts after three attorneys resigned.
Can I say that we need to clean the backlog?
No, native English speakers do not say clean a backlog. The correct idiomatic verb is clear. To clear a backlog means to process all the accumulated items until the queue is completely empty.
Our warehouse staff worked late on Friday to clear the backlog of holiday packages.
Can backlog be plural, or is it always singular?
Backlog is usually singular because the entire pile of work is viewed as a single collective unit. You only use the plural form backlogs when comparing separate accumulations in different departments, branches, or distinct organizations.
Our Boston branch has a backlog of loan applications.
Both the Chicago and Denver offices reported large backlogs during the storm.
Does backlog mean something different in software development and project management?
In software frameworks like Scrum, a product backlog is a deliberate, prioritized list of features and improvements waiting to be built. While traditional everyday usage implies an unwanted delay, technical project management uses backlog as a neutral planning inventory.
The product owner added three user feedback items to the sprint backlog.
Before you go
Remember this
Reserve 'backlog' for accumulated piles of unfinished business rather than individual tasks. Connect it to specific items using 'of,' keep the singular noun with an indefinite article when referring to the pile as one unit, and use verbs like 'tackle,' 'reduce,' and 'clear' to describe progress.
Stage 2 of 5
Listen
Hear it in real sentences, from short to long, and write what you hear.
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Listening 1 of 4
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- The customer support desk faces a heavy backlog of technical tickets following the system update.
- We must tackle the backlog of loan applications before accepting new submissions next week.
Read the transcript
A huge backlog of emails accumulated over the weekend.
'Backlog of emails' names the pile of unread messages that arrived while the office was closed.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
- In 'emails accumulated,' listen for 'email-saccumulated': the final sound connects to the next vowel.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
- In 'emails accumulated,' listen for 'email-saccumulated': the final sound connects to the next vowel.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
- In 'emails accumulated,' listen for 'email-saccumulated': the final sound connects to the next vowel.
Listening 2 of 4
Listen, then type what you hear. Replay as often as you need.
0:00
- The customer support desk faces a heavy backlog of technical tickets following the system update.
- We must tackle the backlog of loan applications before accepting new submissions next week.
Read the transcript
Can our new intern help clear this backlog of invoices?
'Clear this backlog' means processing all the waiting invoices until none remain.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- In 'of invoices,' listen for 'o-finvoices': the f connects directly to the opening vowel of 'invoices.'
- A small word like this is said quickly and softly, not as written.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
- In 'of invoices,' listen for 'o-finvoices': the f connects directly to the opening vowel of 'invoices.'
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
- In 'of invoices,' listen for 'o-finvoices': the f connects directly to the opening vowel of 'invoices.'
Try a longer clip. Listen once, then replay the part you missed.
Listening 3 of 4
Listen, then type what you hear. Replay as often as you need.
0:00
- The customer support desk faces a heavy backlog of technical tickets following the system update.
- We must tackle the backlog of loan applications before accepting new submissions next week.
Read the transcript
We must tackle our backlog of maintenance tickets soon. The regional supervisor will review our open work orders on Monday morning.
'Tackle our backlog' means starting deliberate, aggressive action to resolve the accumulated repairs.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
- The last sound of the first word runs straight into the next word.
This clip is longer. Follow the instruction above the answer field.
Listening 4 of 4
Listen, then type the missing words. The rest of the text is already there.
0:00
- The customer support desk faces a heavy backlog of technical tickets following the system update.
- We must tackle the backlog of loan applications before accepting new submissions next week.
Read the transcript
Our clinic manager noticed a growing backlog of insurance claims after our electronic filing system went offline. Several doctors sent paper forms instead, which slowed our normal billing routine. We brought in two experienced billers today to clear this backlog easily before our monthly financial review. Everyone is confident our team will finish all claims by Friday.
This passage highlights the formation of a backlog due to technical disruption and outlines staff remediation.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- In 'backlog of,' listen for 'backlo-gof': the final g connects smoothly to the next word.
- The last sound of the first word runs straight into the next word.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- In 'backlog of,' listen for 'backlo-gof': the final g connects smoothly to the next word.
- The last sound of the first word runs straight into the next word.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- The last sound of the first word runs straight into the next word.
- In 'backlog of,' listen for 'backlo-gof': the final g connects smoothly to the next word.
- The last sound of the first word runs straight into the next word.
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A huge backlog of emails accumulated over the weekend.
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Your turn
Say it your way
Speak for 30 to 60 seconds from memory. You have months of family photos waiting to be sorted at home. Explain to your sister how this backlog developed and how you plan to choose photos for your grandmother's birthday album.
Use: backlog of tackle the backlog
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Hear how someone else might say it
I've got a backlog of family photos on my laptop because I haven't sorted anything since our summer vacation. Every time someone sends more pictures, I save them and forget about them. I'd like to tackle the backlog before Grandma's birthday so I can make her an album. I'll start with photos of her with the grandchildren, then choose a few from our trips. Could you help me check the dates? Once the album is finished, I'll spend ten minutes each Sunday sorting any new pictures.
Try once more and answer this: Which photos will you sort first?
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