Akademik

have done with it
be/​have done with it informal phrase
to have finished dealing with something, so that you do not have to think about it any more

Let’s just give them what they want and have done with it.

Thesaurus: to finish somethingsynonym to kill a person or animalsynonym
Main entry: done

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have ˈdone with it idiom
(BrE) to do sth unpleasant as quickly as possible, so that it is finished

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Why not tell her you're quitting and have done with it?

Main entry: ↑doneidiom

Useful english dictionary. 2012.