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a bad apple
a bad apple
A person who negatively impacts an entire group of people through his or her words or actions. Taken from the proverb "a bad apple spoils the bunch." Jeremy is really a bad apple. After five minutes with my usually well-behaved kids, they're all acting out.
a bad/rotten apple
one bad person in a group of people who are good You'll find the occasional rotten apple in every organization.