From Old French coissin, from Vulgar Latin *coxinum 'hip-pad,' derived from Latin coxa 'hip' — a cushion was originally a pad to sit on, something for the hips.
A soft bag filled with material, used for sitting on, leaning against, or kneeling on; a pillow or pad.
From Old French coissin (modern French coussin), from Vulgar Latin *coxinum, probably derived from Latin coxa 'hip, thigh.' The cushion was originally something to sit on — a pad for the hip. The Latin coxa itself may be of pre-Indo-European origin. Key roots: coxa (Latin: "hip, thigh (possibly pre-Indo-European)").