CRUPPER

crupper. Crupper, [u as oo] n. a lether to keep a saddle back

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Crup″per (kr?p″p?r in U.S.; kr?p″?r in Eng.), n. [[F. croupi�re, fr. croupe. See Croup the rump of a horse.]] [Written also crouper.] 1. 1. The buttocks or rump of a horse.
2. 2. A leather loop, passing under a horse's tail, and buckled to the saddle to keep it from slipping forwards.