clean (one's) act up(redirected from clean his 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.
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.