keep nose out of
keep (one's) nose out of (something)
To avoid involvement in some thing or issue. Hey, keep your nose out of my private business—it has nothing to do with you anyway.
keep one's nose out of something
Fig. to stay out of something, such as someone else's business. (See also keep one's nose out of someone's business.) Try to keep your nose out of stuff that doesn't concern you. Keep your nose out of my personal affairs.