n. [ F. croupi&unr_;re, fr. croupe. See Croup the rump of a horse. ] [ Written also crouper. ] 1. The buttocks or rump of a horse. [ 1913 Webster ]
2. A leather loop, passing under a horse's tail, and buckled to the saddle to keep it from slipping forwards. [ 1913 Webster ]
v. t. To fit with a crupper; to place a crupper upon; as, to crupper a horse. [ 1913 Webster ]