jamb (n.)

"frolic, merrymaking," 1590s, earlier gambolde "a skipping, a leap or spring" (1510s), from French gambade (15c.), from Late Latin gamba "horse's hock or leg," from Greek kampē "a bending" (on notion of "a joint"); see campus. Ending altered perhaps by confusion with formerly common ending -aud, -ald (as in ribald).

also enjambement, 1837, from French enjambement or from enjamb (c. 1600), from French enjamber "to stride over," from en- (see en- (1)) + jambe "leg" (see jamb).