- keep one's nose clean
- keep one's nose cleanFig. 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.
* * *{v. phr.}, {slang} To stay out of trouble; do only what you should do. * /The boss said Jim could have the job as long as he kept his nose clean and worked hard./ * /The policeman warned the boys to keep their noses clean unless they wanted to go to jail./ Compare: STEER CLEAR OF(2).
Dictionary of American idioms. 2013.