The idiom "keep one's nose clean" is thought to have originated in the United States in the early 20th century. The phrase likely derives from the idea that a person who stays out of trouble or avoids wrongdoing tends to have a clean, unblemished reputation. This phrase is used to refer to an individual who avoids engaging in unlawful or morally questionable activities and behaves in a manner that avoids suspicion or wrongdoing.

What is the origin of the idiom "keep one's nose clean" and when to use it?

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to [keep] {one's} nose clean

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Визначення та значення слова « keep one's nose clean» англійською мовою

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