Meaning of “know something like the back of your hand” in the English Dictionary

american-english dictionary

"know something like the back of your hand" in American English

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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)