clean 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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
clean one's act up
to reform one's conduct; to improve one's performance. We were told to clean our act up or move out. I cleaned up my act, but not in time. I got kicked out.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.