One bad apple can spoil the whole bunch

Meaning: Corruption spreads contagiously; a single morally compromised person can undermine an entire group's integrity.

Origin: A rotting apple gives off ethylene gas, which speeds the ripening and decay of the apples around it, so one bad fruit really can spoil a barrel. The saying is found among 14th-century Latin proverbs, Chaucer quotes it in The Cook's Tale, and Benjamin Franklin printed "The rotten apple spoils his companion" in 1736.

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