Idiom
On thin ice
What does 'on thin ice' mean?
'On thin ice' means being in a precarious position where another mistake could bring serious consequences after earlier problems. For example: 'After two missed deadlines, the consultant is on thin ice with the client.' Use 'with someone' to identify whose patience is nearly exhausted; 'skate on thin ice' highlights ongoing risky behaviour.
Key points
- The idiom describes genuine risk caused by earlier mistakes.
- Use 'on thin ice' without 'the' or 'a'.
- Add 'with' to identify whose patience is running out.
- 'Skate on thin ice' stresses ongoing risky behaviour.
Can you use "On thin ice" yourself?
This lesson has 5 stages. You can stop at any time and continue later.
Stage 1 of 5
Understand
What it means, when to use it, and mistakes to avoid.
The full explanation
To be on thin ice means to occupy a risky or insecure position where previous mistakes have tested someone's patience and one further mistake will trigger serious consequences.
I forgot the team report this morning, so I am on thin ice with our manager.
Why it works: The speaker admits that an earlier error made their current standing fragile.
2 more examples
-
If you borrow my car without asking again, you will be on thin ice.
This warning shows that repeating an unwelcome action will exhaust trust and trigger penalties.
-
The tenant was skating on thin ice by playing loud music after midnight.
The continuous verb emphasizes ongoing behavior that tests the neighbors' patience.
Read the full guide
Decide if someone's position is truly at risk
Thin ice on a frozen pond cannot support heavy weight. If you walk on it, the surface can crack and plunge you into freezing water. In everyday speech, being on thin ice describes a position where someone has already pushed a situation close to failure. A further error, delay, or careless remark will trigger a serious consequence, such as losing a privilege, facing formal discipline, or losing someone's trust. The bad outcome is not guaranteed, but the safety margin is gone. Do not use this idiom for normal nervousness, such as feeling shy before giving a presentation. It requires a genuine risk created by earlier actions.
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After missing two project deadlines, the contractor is on thin ice with the school board.
Why it works: Repeated past delays mean another delay could terminate the building contract.
-
She felt nervous before the interview, but she was well prepared.
Why it works: Here 'on thin ice' does not fit because feeling nervous is not a risky standing caused by earlier misconduct.
Your turn
Which situation correctly uses the idiom 'on thin ice'?
Answer: A tenant received two noise warnings and will face eviction if neighbors complain again.
Show the answer
Answer: A tenant received two noise warnings and will face eviction if neighbors complain again.
The idiom requires a fragile position where earlier missteps mean another mistake will bring serious trouble.
Recognize the risk in a shared-kitchen warning
Living with other people requires shared trust, especially around communal food. Imagine four housemates who buy their own groceries. One person repeatedly drinks someone else's milk, eats leftovers from the refrigerator, and forgets to replace shared cooking oil. A single missing snack might cause minor irritation, but repeated behavior pushes housemates to their limit. Notice how this dialogue shows the boundary between patience and a concrete consequence.
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Maya: 'Someone drank the almond milk I bought yesterday, and the carton was in your room, Sam.' Sam: 'I was in a rush before work, so I grabbed it. I will replace it tomorrow.' Maya: 'You said that last week about the cheese. You are on thin ice, Sam. If you take our food again without asking, we will change the kitchen storage rules and lock our cupboards.'
Why it works: The dialogue establishes past repeated actions, the present fragile standing, and a specific future consequence.
This also comes up in On the line and Take your mind off something.
Your turn
Why does Maya tell Sam that he is on thin ice?
Answer: Sam repeatedly took shared food, and another incident will lead to locked cupboards.
Show the answer
Answer: Sam repeatedly took shared food, and another incident will lead to locked cupboards.
Maya uses the idiom because Sam's repeated behavior has exhausted his housemates' patience, setting up a clear consequence.
Form the phrase with be and identify who is upset
The basic pattern uses the linking verb 'be' followed directly by the prepositional phrase 'on thin ice'. You can conjugate 'be' for any subject and tense: 'I am on thin ice', 'you are on thin ice', 'she was on thin ice', or 'they were on thin ice'. When you want to name the person or group whose patience is nearly gone, add the preposition 'with'. You can also use 'put someone on thin ice' to name the specific action or decision that created the danger.
-
I forgot our anniversary dinner, so I am on thin ice with my partner.
Why it works: Adding 'with my partner' identifies who is upset and whose patience is limited.
-
Arriving late to the client briefing put the account manager on thin ice.
Why it works: The causative verb 'put' shows what event caused the insecure position.
Your turn
Which sentence correctly identifies whose patience is running out?
Answer: He was on thin ice with the regional director after missing the budget review.
Show the answer
Answer: He was on thin ice with the regional director after missing the budget review.
English connects the person holding authority or losing patience using the preposition 'with'.
Choose between a risky situation and risky action
English gives you two related ways to frame the danger. Use 'be on thin ice' when you want to describe a person's current position or status. Use 'skate on thin ice' or 'tread on thin ice' when you want to highlight their risky behavior as it happens. These two choices share the same basic meaning and overlap in conversation. You do not need to treat them as separate rules, but choosing the verb 'skate' gives your sentence a more active, visual rhythm.
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After two safety violations, the crane operator is on thin ice.
Why it works: Here 'is on thin ice' describes the operator's current administrative standing.
-
You are skating on thin ice by operating heavy equipment without your helmet.
Why it works: The continuous verb 'skating' emphasizes the ongoing risky choice.
Your turn
Which sentence focuses most on an ongoing risky action?
Answer: You are skating on thin ice by ignoring the customer's written safety guidelines.
Show the answer
Answer: You are skating on thin ice by ignoring the customer's written safety guidelines.
'Skating on thin ice' highlights the ongoing reckless conduct rather than just a passive state.
Judge the social weight of a direct warning
Telling someone 'You are on thin ice' is a direct, forceful statement. In many households and workplaces, hearing this phrase directly from a parent, supervisor, or partner feels stern and potentially confrontational. When you talk about your own position, saying 'I am on thin ice' sounds candid and humble because you acknowledge your mistake. If your goal is to deliver a clear warning without sounding aggressive, use a direct conditional sentence (see /grammar/conditionals/) or have a private conversation (see /idioms/have-a-word/) to explain the exact rule and consequence.
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If you take food from the communal fridge without asking, you will need to buy your own mini fridge.
Why it works: This plain alternative communicates the boundary and consequence clearly without using a dramatic idiom.
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I know I am on thin ice with the landlord after paying rent late two months in a row.
Why it works: Applying the phrase to oneself acknowledges personal responsibility without escalating tension.
Your turn
How does saying 'You are on thin ice' typically affect a conversation?
Answer: It delivers a stern, forceful warning that can sound sharp or aggressive.
Show the answer
Answer: It delivers a stern, forceful warning that can sound sharp or aggressive.
Addressing someone directly with this idiom creates a severe tone because it highlights impending punishment.
Avoid common preposition and article errors
Learners often make three small grammatical errors with this idiom. First, do not swap 'on' for 'in'; saying 'in thin ice' is incorrect because the image is standing on top of a frozen surface. Second, do not add an indefinite article; 'on a thin ice' is wrong because 'ice' is an uncountable noun. Third, leave out the definite article 'the' in figurative speech. While you might say 'The dog walked on the thin ice covering the pond' in a literal report, the idiom never uses 'the'.
-
The new delivery driver is on thin ice after damaging the company van.
Why it works: The idiom correctly uses 'on' without an article before 'thin ice'.
-
Warning signs tell hikers that the thin ice near the riverbank will collapse.
Why it works: The article 'the' is correct here because this sentence describes physical ice on a specific river.
Your turn
Which sentence uses correct grammar for the idiomatic expression?
Answer: The intern realized she was on thin ice after deleting the customer database.
Show the answer
Answer: The intern realized she was on thin ice after deleting the customer database.
The idiomatic expression requires the preposition 'on' and does not take an article.
Connect spoken sounds without losing word boundaries
In natural spoken English, words that end in consonants connect smoothly to words that start with vowels. In the phrase 'thin ice', the final /n/ sound carries over into the beginning of 'ice', making it sound like 'thin-nice'. Listeners can also mistake the unvoiced /θ/ sound in 'thin' for /t/ or /f/. Pay attention to the ending /s/ sound in 'ice', which distinguishes it from 'eyes' with its vibrating /z/ sound. Contractions like 'you're' sound identical to 'your', so rely on the verb position to write the correct form.
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You're on thin ice.
Why it works: Notice that 'you're' requires an apostrophe because it contracts 'you are', while 'thin ice' links into /θɪn.aɪs/.
-
Close your eyes near the cold ice.
Why it works: This contrast shows that 'eyes' ends with the /z/ sound, while 'ice' ends with the voiceless /s/ sound.
Your turn
Why does 'thin ice' often sound like a single word to language learners?
Answer: The final consonant sound /n/ links directly into the vowel sound /aɪ/.
Show the answer
Answer: The final consonant sound /n/ links directly into the vowel sound /aɪ/.
Consonant-to-vowel linking connects the /n/ of 'thin' to the /aɪ/ of 'ice', blurring the word boundary.
Recall the idiom and state the consequence
To master this expression, you must produce the correct form quickly and explain the practical outcome that could follow. An incomplete warning tells someone they are in danger without clarifying what will happen. When you write or speak, pair the idiom with a clear condition using 'if' or 'unless'. Review this practice scenario: Marcus arrived late to his warehouse shift three times this month. His shift supervisor gave him a written reminder yesterday. Marcus now knows that another late arrival will result in a suspension.
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Marcus is on thin ice, so another late shift will lead to an immediate suspension.
Why it works: The sentence names the fragile state and connects it directly to a tangible future penalty.
-
We were skating on thin ice until the revised contract was signed.
Why it works: The past continuous form shows a temporary period of heightened administrative risk.
Your turn
Complete the warehouse scenario: 'Marcus knows he is ___ after three late arrivals, and one more delay will cost him his job.'
Answer: on thin ice
Show the answer
Answer: on thin ice
The correct idiom is 'on thin ice', without an article and with the preposition 'on'.
Common mistakes with "on thin ice"
What learners often say, what to say instead, and why.
-
Not this:
The assistant is in thin ice with the director.Say: The assistant is on thin ice with the director.
The fixed idiom requires the preposition 'on', not 'in'.
-
Not this:
The driver is on the thin ice after another violation.Say: The driver is on thin ice after another violation.
Figurative usage omits the article before 'thin ice'.
-
Not this:
The technician is on a thin ice with her supervisor.Say: The technician is on thin ice with her supervisor.
The idiom does not use the indefinite article 'a'.
-
Not this:
The analyst is on thin ice by the committee.Say: The analyst is on thin ice with the committee.
'With' names the person or group whose patience is nearly exhausted.
Use it naturally
How people really use “on thin ice”
Neutral Fine almost anywhere, at work or with friends.
Words it often goes with
- on thin ice withHe's on thin ice with the club organizer after missing two events.
- skating on thin iceYou're skating on thin ice by ignoring the guide's warning.
- already on thin iceShe's already on thin ice after returning the rental equipment late twice.
What people also say
- “You're on thin ice with the manager.” instead of “You are in an insecure position regarding the manager's patience.”The idiom makes the warning sound more conversational and direct.
Questions about "On thin ice"
What does 'on thin ice' mean?
It means being in a dangerous or precarious position where someone's patience has worn thin. If you make one more mistake, you will likely face serious discipline, loss of privileges, or damaged trust.
The employee was on thin ice after arriving late for the third time.
Does it mean I am already in trouble?
Not completely, but you are very close to it. Being on thin ice means you have avoided a final punishment so far, but your safety margin is gone. Any additional mistake will trigger negative consequences.
You are not fired yet, but you are definitely on thin ice.
Can I say 'on thin ice with someone'?
Yes, adding 'with' followed by a person or organization is common and natural. It indicates whose patience is nearly exhausted or who holds the authority to penalize you.
I am on thin ice with my landlord after making noise late at night.
The supplier is on thin ice with our purchasing committee.
What is the difference between 'on thin ice' and 'skating on thin ice'?
'Be on thin ice' describes a risky situation or standing, while 'skate on thin ice' emphasizes the active, ongoing behavior that creates the risk. However, their meanings overlap heavily in everyday conversation.
He is on thin ice after that audit.
He is skating on thin ice by continuing to ignore client emails.
Is saying 'You're on thin ice' rude or threatening?
It is not inherently rude profanity, but it functions as a stern and forceful warning. When spoken by a manager, teacher, or partner, it carries social weight and can sound confrontational if delivered aggressively.
A calm supervisor might say: 'Please remember our policy, because another error puts you on thin ice.'
Why do we not say 'on the thin ice' in this idiom?
Fixed English idioms often omit articles before uncountable nouns. When speaking figuratively about risk, English uses 'on thin ice' as a set phrase. You only include 'the' when describing literal frozen water.
The park ranger warned us that the thin ice on the lake could crack.
Figuratively, the careless driver is on thin ice with the traffic court.
Before you go
Remember this
Use 'on thin ice' when a person faces serious consequences after earlier missteps. Keep the preposition 'on', leave out the article 'the', and remember that direct warnings sound stern unless paired with clear expectations.
Stage 2 of 5
Listen
Hear it in real sentences, from short to long, and write what you hear.
0 of 4 done
Listening 1 of 4
Listen, then type what you hear. Replay as often as you need.
0:00
- If you borrow my car without asking again, you will be on thin ice.
- The tenant was skating on thin ice by playing loud music after midnight.
Read the transcript
You are on thin ice after that loud party.
The unvoiced /θ/ sound in 'thin' must not be replaced with /t/ or /f/. Notice how the /n/ at the end of 'thin' links smoothly into the vowel sound of 'ice'.
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 'that loud,' listen for 'tha(t) loud': the t may drop out before l.
- The final t or d is barely said before the next consonant.
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.
- 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.
- In 'that loud,' listen for 'tha(t) loud': the t may drop out before l.
Listening 2 of 4
Listen, then type what you hear. Replay as often as you need.
0:00
- If you borrow my car without asking again, you will be on thin ice.
- The tenant was skating on thin ice by playing loud music after midnight.
Read the transcript
I know I am on thin ice with our supervisor.
The phrase 'with our supervisor' indicates who is losing patience. The word 'ice' ends with a voiceless /s/ sound, unlike 'eyes' which ends with /z/.
Listen for
At natural speed these words change shape. Tap one to hear it again.
- In 'am on,' listen for 'a-mon': the final m connects to the next vowel.
- 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.
- In 'am on,' listen for 'a-mon': the final m connects to the next vowel.
- 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.
- In 'am on,' listen for 'a-mon': the final m connects to the next vowel.
- 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.
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
- If you borrow my car without asking again, you will be on thin ice.
- The tenant was skating on thin ice by playing loud music after midnight.
Read the transcript
Our manager noticed your late arrival this morning, so you are skating on thin ice if you skip tomorrow's team check-in.
The verb 'skating' describes ongoing risky behavior. In connected speech, 'skating on' blends together with a quick tap or flap in American English.
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 American English this t sounds like a quick, soft d.
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.
- 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 American English this t sounds like a quick, soft d.
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
- If you borrow my car without asking again, you will be on thin ice.
- The tenant was skating on thin ice by playing loud music after midnight.
Read the transcript
Everyone in the flat agreed to wash their cookware right after dinner, but you left dirty pans in the sink again. You are on thin ice with the entire group, and if this happens one more time, we will ask you to prepare meals separately.
In natural conversation, 'You are' is often spoken rapidly, and 'thin ice with' flows continuously without pauses between the words.
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 'right after,' listen for 'righ-tafter': the final t connects to the next vowel.
- 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 'right after,' listen for 'righ-tafter': the final t connects to the next vowel.
- 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 'right after,' listen for 'righ-tafter': the final t connects to the next vowel.
- The last sound of the first word runs straight into the next word.
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Save my progressStage 3 of 5
Speak
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Shadow
Say it along with the speaker
You are on thin ice after that loud party.
Play the line slowly, then speak at the same time as the speaker. Copy the rhythm, not just the words.
Your turn
Say it your way
Speak for 30 to 60 seconds from memory. You are visiting a museum with a friend who keeps touching the exhibits despite staff warnings. Explain to your friend why another incident could get them removed and suggest how to enjoy the rest of the visit.
Use: on thin ice skating on thin ice
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0:00
Hear how someone else might say it
Look, you're on thin ice with the museum staff. That guard has already asked you twice to stop touching the sculptures, and reaching over the barrier again would really test her patience. You're skating on thin ice by treating those warnings like a joke. If it happens again, she could ask you to leave, and we'd miss the photography exhibition upstairs. I'd apologize briefly and give the exhibits more space. We can still enjoy the visit. There's an interactive room where touching the displays is actually encouraged, so let's head there next.
Try once more and answer this: Do you think the staff would actually make me leave?
Stage 4 of 5
Write
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Write
Put it in your own words
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- It is about my life, not the lesson’s example.
- I read it once aloud to check it sounds right.
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