More about jeu d'esprit
Jeu d’esprit, “a witticism,” is a borrowing from French, in which it literally means “game of spirit.” Jeu, “game,” comes from Latin jocus, “joke,” which is the source of jeopardy, jewel, and jocular. Meanwhile, esprit comes from Latin spīritus, “spirit, breath,” from spīrāre, “to breathe”; compare aspire, expire, perspire, and respire. The plural of jeu d’esprit is jeux d’esprit, in both English and French, with only the “game” element becoming plural. Though most French nouns add -s when made plural, most nouns ending in -eu add -x. Jeu d’esprit was first recorded in English in the 1710s.
EXAMPLE OF JEU D’ESPRIT USED IN A SENTENCE
The unexpected jeu d’esprit that closed the speech had the entire room roaring with laughter.