Anglo-Norman cropere, from Old French cropiere, from the same Germanic base as croup.
- a strap used to stop a saddle from slipping
#:*1882: I sought among the mules one with a mild expression of generosity and gentleness in its eyes, and found it in a white mule with a crupper adorned with arabesques. â€” Edmondo de Amicis, Morocco: Its People & Places, tr. C. Rollin-Tilton
- the buttocks or rump, especially of a horse
- a piece of armour covering the hindquarters of a horse