know like the back of one's hand

Definition

To be intimately knowledgeable about something.

Example Sentences

• "He knows the software like the back of his hand, and can often solve problems over the phone, without looking."
• ""I can; know that country like the back of my hand. You haven't got a road map, I suppose. Well, no matter, I'll give you the lay of the land without it.""
• "“I know American audiences like the back of my hand,” she says, sitting in a dressing room in London at the end of a long day of rehearsals; […]"