know like the back of hand

know something like the back of your hand (informal)

to know a place very well. He knew East London like the back of his hand.

See also: back, hand, know, like

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know something like the back of your hand

to be very familiar with something. He knows the nighttime sky like the back of his hand.

know something backwards and forwards

Etymology: based on the idea that you know what your own hand is like very well

See also: back, hand, know, like