
A rotten apple
Negative Impact
Emphasizes that one person's bad behavior can affect an entire group.

She was the rotten apple that disrupted the team's harmony.
Metaphorical Use
Used figuratively to represent a harmful influence, not an actual fruit.

A rotten apple in the class can set a bad example for all students.
Context Sensitive
Best used in contexts discussing group dynamics or ethical concerns.

The new employee turned out to be a rotten apple, leaking confidential information.
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