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

• give someone the heebie-jeebies
• give someone their due
• give someone their head
• give someone their marching orders
• give someone their walking papers
• give someone the jitters
• give someone the kiss of life
• give someone the nod
• give someone the old heave ho
• give someone the once-over
• give someone the push
• give someone the right of first refusal
• give someone the right to first refusal
• give someone the rough side of tongue
• give someone the rough side of your tongue
• give someone the runaround
• give someone the sack
• give someone the shaft
• give someone the shits
• give someone the shivers
• give someone the slip
• give someone the time of day
• give someone the willies
• give someone the works
• give some stick