Etymology
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coup de grace (n.)

"a single blow or stroke, dispatching one condemned or mortally wounded to put an end to misery," 1690s, from French coup degrâce, literally "stroke of grace;" the merciful death-blow that ends another's suffering (see coup + grace (n.)).

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Definitions of coup de grace

coup de grace (n.)
the blow that kills (usually mercifully);
Synonyms: deathblow
From wordnet.princeton.edu