The idiom "keep your nose clean" means to stay out of trouble or to avoid doing anything wrong or illegal. It is often used as a piece of advice or warning to someone who has a tendency to get into trouble or has a history of breaking rules.
For example, a parent might tell their teenager to "keep their nose clean" when they go out with their friends, meaning they should avoid getting involved in any risky or illegal activities. Similarly, a boss might tell their employee to "keep their nose clean" if they have been warned about their behavior at work.
The phrase "keep your nose clean" is thought to have originated in the early 20th century, and it likely comes from the idea that someone who is doing something wrong might have a dirty or runny nose from the stress of trying to hide their misdeeds.
Overall, this idiom is a useful way to remind someone to be careful and avoid getting into trouble, and it can be used in a variety of situations where someone needs to stay on the right path.
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