clean up act
Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Encyclopedia.
clean up your act
to improve your behavior He used to drink a lot, but he seems to have cleaned up his act.
clean up your act(informal)
to stop doing things that other people do not approve of and start to behave in a more acceptable way There's a very strong anti-press feeling at the moment. A lot of people think it's time they cleaned up their act.
clean up (one's) actSlang
To improve one's behavior or performance.