Meaning of “the exception that proves the rule” in the English Dictionary

british dictionary

"the exception that proves the rule" in British English

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the exception that proves the rule

something that emphasizes the general truth of a statement by disagreeing with it:

Most company directors are middle-aged men, but this 28-year-old woman is an exception that proves the rule.

(Definition of “the exception that proves the rule” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)