The idiom "know something like the back of one's hand" suggests that someone is intimately familiar with a subject or topic, just as they are with the physical features of their own hand. It implies a deep and thorough knowledge of the subject. This expression is used to emphasize how well someone knows or understands something, indicating a high level of familiarity and expertise.

What is the origin of the idiom "know something like the back of one's hand" and when to use it?

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to [know] {sth} like the back of {one's} hand

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英語での「know something like the back of one's hand」の定義と意味

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