Definition of crupper in US English:



  • A strap buckled to the back of a saddle and looped under the horse's tail to prevent the saddle or harness from slipping forward.

    • ‘Donkeys and mules don't have the big shoulders horses have, so their saddles have a special tail piece called a crupper to prevent saddle and rider from sliding forward onto the animal's neck.’
    • ‘Attached to the back edge of the aparejo's two sacks was a crupper, a broad leather strap, that ran around the animal's hindquarters and under its tail.’
    • ‘‘Remember not to touch the horse's crupper and stand behind them,’ the coach warned us again and again.’


Middle English: from Old French cropiere, related to croupe (see croup). Compare with croupier.