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English definition of “know something like the back of your hand”

know something like the back of your hand

to know a place very well: She’ll give you the name of a place to stay – she knows the area like the back of her hand.
(Definition of know something like the back of your hand from the Cambridge Academic Content Dictionary © Cambridge University Press)

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the quality of knowing someone very well, liking them a lot, and wanting to spend a lot of time together

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