IdiomDaily LifeFrench

Un coup de Jarnac

Meaning: An unexpected decisive stroke, delivered within the rules but not quite sportingly.

Literally: A Jarnac blow

Example: “À la dernière minute, son associé lui a porté un coup de Jarnac en rachetant ses parts.” — At the last minute, his partner dealt him a low blow by buying out his shares.

English equivalent: A low blow

Equivalents in other languages

Origin: In a judicial duel of 1547 before Henri II, Guy Chabot de Jarnac won by an unforeseen low cut to his opponent's knee. The stroke was legal, which is exactly why the phrase carries ambiguity rather than simple condemnation.

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