Definition of finish with
1 : to have no further need for (something) : to stop using (something) Could I see the newspaper when you finish with it?
2 : to stop being involved with (someone) : to end a romantic relationship with (someone) She and her boyfriend had another fight, and now she says she's going to finish with him once and for all.
3 : to stop dealing with, working on, or punishing (someone or something) When I finish with him he'll be sorry! I haven't finished with you yet!
Seen and Heard
What made you want to look up finish with? Please tell us where you read or heard it (including the quote, if possible).