The idiom "to pay an arm and a leg" means to pay a very high price for something. It is used when you want to emphasize that something is very expensive, and you had to pay a lot of money for it.
For example, if someone says, "I just bought a new car," you might respond, "Wow, that's great! Did you have to pay an arm and a leg for it?" This means that you are asking if the car was very expensive.
The origin of this idiom is not clear, but it is believed to have originated in the early 20th century. It is thought to have come from the idea that losing an arm or a leg would be a very high price to pay for something, just like paying a lot of money for something is a high price to pay.
In summary, "to pay an arm and a leg" means to pay a very high price for something, and it is used to emphasize that something is very expensive.
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