n. menial work; hard work. : Why do I always get stuck with the dirty work?
n. sneaky activities. : I hear that Sam is up to his old dirty work again.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Idioms & Phrases
dirty work
An unpleasant, distasteful, or thankless task or job. For example, Jane complained that she had to do all the dirty work while her colleagues took long vacations. [First half of 1900s]