student asking question

Could you tell me the meaning of "front and back"?

teacher

Native speaker’s answer

Rebecca

The idiom "know something front and back" means to be an expert on something or to study something and have complete knowledge of it. This idiom comes from the original expression which is to "know something backwards and forwards". This expression is perhaps more common to use than "front and back". Ex: She's read the book so many times, she knows it backwards and forwards. Ex: He knows cars front and back.

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