keep one’s 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

tv. to keep out of trouble, especially trouble with the law. I can keep my nose clean. Don’t worry.
See also: clean, keep, nose
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • keep (one's) nose clean
  • keep 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