Origin: 1275–1325; earlier also cush, pl. cushies (the pl. cush(i)e-s misanalyzed as cush-(i)es), ME quissheu, kusheu, pl. quyssewes, cusschewis < OF quisseuz, cuisseus, pl. of cuissel, equiv. to cuisse thigh (< L coxa hipbone) + -el n. suffix
cuisse (kwĭs) n. Plate armor worn to protect the front of the thigh.
[Middle English quisse, probably back-formation from quisseues, pl. of quisseu, cuisse, from Old French quisseuz, pl. of quissel, from quisse, thigh, from Latin coxa, hip.]