To reform; to improve one's habits.
shape up
To improve; to correct one's bad habits or behavior.
clean up
To become clean, handsome, smart in appearance, e.g. for a special occ…
clean someone's clock
To defeat someone decisively, in a physical fight or other competition…
clean as a hound's tooth
Very clean.
clean as a whistle
clean hands
Freedom from guilt, especially from the guilt of dishonesty in money m…