know the ins and outs (of something)

know the ins and outs (of something)

To know the particular details and nuances of a situation, task, etc. I'm not surprised he made such a stupid mistake—he doesn’t know the ins and outs of this business. Come to me if you have any questions. I've been here seven years, so I know the ins and outs.

See also: and, INS, know, out

Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.