Coup de Jarnac

Coup de Jarnac

to hit a man while he is down. [Fr. Folklore: Espy, 62]
Mentioned in ?
References in classic literature ?
But the chevalier believed that his rival had still such strong chances of success that he dealt him this coup de Jarnac with a blade (namely, Suzanne) that was finely tempered for the purpose.
Le coup de Jarnac hongrois a ete egalement denonce par le president du Parlement europeen, Martin Schulz, mettant en garde contre [beaucoup moins que] le jeu dangereux [beaucoup plus grand que] de la Hongrie.
Though the action was successful and the Count won, it was considered unsporting and the term un coup de Jarnac came into being, to describe a low blow.