Etymology
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coup (n.)

c. 1400, "a blow" (obsolete), from Old French coup, colp "a blow, strike" (12c.), from Medieval Latin colpus, from Vulgar Latin *colapus, from Latin colaphus "a cuff, box on the ear," from Greek kolaphos "a blow, buffet, punch, slap," "a lowly word without clear etymology" [Beekes].

Meaning "a sudden decisive act" is 1852, short for coup d'etat. In Modern French the word is a workhorse, describing everything from a pat on the back to a whipping, and is used as well of thunder, gusts of wind, gunshots, and chess moves.

Origin and meaning of coup

updated on October 13, 2021

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Definitions of coup from WordNet

coup (n.)
a sudden and decisive change of government illegally or by force;
Synonyms: coup d'etat / putsch / takeover
coup (n.)
a brilliant and notable success;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.