crupper

Meanings

1. A strap, looped under a horse's tail, used to stop a saddle from slipping.
2. The buttocks or rump, especially of a horse.
3. A piece of armour covering the hindquarters/buttocks of a horse.

1. To fit with a crupper; to place a crupper upon.

Etymology

From Middle English croper, crouper, from Anglo-Norman cruper, cropere, from Old French cropiere, crupiere, from the same Germanic root as croup. Doublet of croupiere.