Cost an arm and a leg: meaning and use

The idiom describes a large cost. It often shows surprise or a complaint, but a speaker can also think an expensive purchase was worth the money. The expression tells you how the speaker feels about the price.

There is no fixed amount that counts as an arm and a leg. A repair, a train ticket or a month's rent can feel expensive in its situation. Check the price and the speaker's reaction together.

In this idiom, an arm and a leg means a lot of money. The body parts create an exaggerated picture. A person who says it about a bill is describing the price, not reporting an injury.

Keep an before arm and a before leg. Learn the words together as an arm and a leg. Replacing them with other body parts will not give you the standard expression.

With cost, put the thing, service or activity first. Add the person who pays after cost if that information matters. Use me, you, him, her, us or them in this position.

You can leave the buyer out when the sentence is about the price in general. Do not put for before the buyer after cost. The shorter pattern is thing + cost + person + amount.

Use costs for a single thing in the present and cost for plural things. When you describe a past price, the past form is also cost. The words an arm and a leg stay the same.

Use will cost for a future price and would cost for an imagined purchase. The form costed has a different use when someone calculates a price; it is not the past-price form needed in these examples.

If you want to start with the person who spends the money, use pay an arm and a leg for something. The past form is paid. The preposition for introduces what the person bought.

The two patterns describe the same purchase from different starting points. With cost, the purchase comes first. With pay, the buyer comes first. Keep the order clear rather than combining parts of both patterns.

A negative sentence changes the message. Doesn't cost an arm and a leg means the speaker does not consider the price extremely high. It does not necessarily mean the item is free or the cheapest option.

After does, doesn't, did or didn't, use cost without an ending. In a conversation, a question with the idiom checks whether a price was high; use how much when you need the exact amount.

The expression is informal. It works in a chat with a friend or a relaxed conversation with a colleague. Because it adds a strong reaction, it can sound like a complaint when you say it directly to someone selling a service.

For a formal budget or a request to change a price, give the amount and explain the problem. Very expensive is a neutral alternative. The idiom is not a precise claim that a seller has charged an unfair price.

Follow the idiom with a reason, decision or result. So can introduce a decision caused by the high price. But can explain why you still bought something despite the cost.

You can also use cost a fortune to emphasize a large expense. Very expensive states the same basic price judgment more plainly. Choose one expression that fits your listener, then add the detail that matters.