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3. know like the back of hand

know like the back of hand

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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.

Related vocabulary: 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, of

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, of