keep one's nose clean=to avoid getting into trouble
Nose鼻子，clean干净， Keep one's nose clean表面的意思是“让你的鼻子保持干净”，引申义是行为检点，安分守己。
01
You better keep your nose clean, kid, or you're going to run into trouble.
孩子，你最好老实点，否则你就会惹麻烦。
02
I'm trying to keep my nose clean by staying away from those rough guys.
我得离那些坏蛋远点，以免给我惹麻烦。
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