keep one's nose clean
American Heritage Dictionary of Idioms:
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keep one's nose clean
Stay out of trouble. For example, Dad told Brian to keep his nose clean from now on or he'd cut off his allowance. [Colloquial; late 1800s]
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keep one's nose clean
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American Heritage Dictionary of Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.
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