Definition of Keep one's nose clean

ENGLISH IDIOMS 2.EDITION
keep one`s nose clean
stay out of trouble The judge told the young man that he must keep his nose clean if he didn`t want to go to jail in the future.

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Keep one's nose clean definition was found in categories: Language, Idioms & Slang(2)  

Keep one's nose clean Definition from Language, Idioms & Slang Dictionaries & Glossaries

Australian Slang
Keep one's nose clean
follow rules and regulations meticulously so as to avoid any blame

English Idioms WM 1.3a
keep your nose clean
stay out of trouble, toe the line 
Keep your nose clean, and you'll get out of prison sooner.