- Home
- Idioms
- know like the back of hand
know like the back of hand
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 forwardsEtymology: based on the idea that you know what your own hand is like very well
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.