clean one’s act up

clean (one's) act up

To improve one's behavior. After I got in yet another fight at school, the headmaster told me that I had to clean my act up or else I'd be expelled.
See also: act, clean, up
Farlex Dictionary of Idioms.

clean one’s act up

tv. to reform one’s conduct; to improve one’s performance. We were told to clean our act up or move out.
See also: act, clean, up
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • clean (one's) act up
  • clean act up
  • clean up (one's) act
  • clean up act
  • clean up your act
  • change (one's) ways
  • change your ways
  • mend (one's) ways
  • mend one's ways
  • mend your ways