keep nose clean

keep (one's) nose clean

To behave properly; to stay out of trouble. You better keep your nose clean, kid, or you're going to run into trouble you can't handle.
See also: clean, keep, nose
Farlex Dictionary of Idioms.

keep one's nose clean

Fig. to keep out of trouble, especially trouble with the law. I'm trying to keep my nose clean by staying away from those rough guys. John, if you don't learn how to keep your nose clean, you're going to end up in jail.
See also: clean, keep, nose
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

keep (one's) nose clean

Informal
To stay out of trouble.
See also: clean, keep, nose
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • keep (one's) nose clean
  • keep one’s nose clean
  • keep one's nose clean
  • keep your nose clean
  • you could eat off the floor(s)
  • clean (someone or something) out of (something)
  • clean out of
  • clean-up operation
  • operation
  • clean out