student asking question

What does "coast" mean here? and what kind of expression is this?

teacher

Native speaker’s answer

Rebecca

"Coast" in this expression means area. The "coast looks clear" is an idiomatic expression that means the area is free from anyone who may catch you doing something, especially something that you are not supposed to be doing. It's more common to say "the coast is clear" than it is to say "the coast looks clear" but both mean the same thing and both are fine to use. Ex: The coast is clear. Do it now! Ex: The coast looks clear. Let's go! Ex: The thieves waited until the coast was clear before breaking into the store.

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