know (something) backwards and forwards

to be extremely well informed about something.

After 30 years in the fashion business, she knows it backwards and forwards.

He knows New York inside out.

Related vocabulary: know something like the back of your hand

• at the mercy of someone
• at the mercy of something
• at the moment
• at the most
• at the outside
• at the point of
• at the point of something
• at the ready
• at the ripe old age of
• at the ripe old age of something
• at the top of agenda
• at the top of lungs
• at the top of someone's agenda
• at the top of the agenda
• at the top of the ladder
• at the top of voice
• at the top of your lungs
• at the top of your voice
• at the very least
• at this stage of the game
• at times
• attribute something to
• attribute something to someone
• attribute something to something
• attribute to