IdiomDaily LifeEnglish

the exception that proves the rule

Meaning: A case that breaks a general rule, said as if it showed that the rule normally holds; often used loosely to dismiss a counterexample.

Example: “He's never on time, so his arriving early yesterday was the exception that proves the rule.”

Equivalents in other languages

Origin: A translation of the Latin legal maxim exceptio probat regulam in casibus non exceptis, "the exception proves the rule in the cases not excepted," drawn from Cicero's speech Pro Balbo (56 BC): an exception that is spelled out implies a rule for every case not mentioned. Probat also meant "tests," and some have read the phrase as "the exception tests the rule," but the legal sense is "confirms." With the second half dropped, the phrase came to be used loosely of any case that does not fit.

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