Know-like-the-back-of-one-s-hand definition

(idiomatic) To be intimately knowledgeable about something, especially a place.

He knows the software like the back of his hand, and can often solve problems over the phone, without looking.

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Alternative Forms

Alternative Form of know-like-the-back-of-one-s-hand - know-like-the-palm-of-one-s-hand