The idiom "know someone or something inside out" suggests an in-depth understanding or familiarity with a person, object, or subject. It implies knowing every detail, characteristic, or aspect thoroughly, as if one has explored its inner workings. This expression is used to emphasize a high level of knowledge, expertise, or familiarity with someone or something. It signifies that the individual has a comprehensive understanding, leaving no hidden aspects or mysteries.

What is the origin of the idiom "know someone or something inside out" and when to use it?

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to [know] {sb/sth} inside out

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英語での「 know somebody or something inside out」の定義と意味

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