DICT.TW Dictionary Taiwan

 crup·per /ˈkrʌpɚ/
 屁股,馬屁股

 Crup·per, v. t. To fit with a crupper; to place a crupper upon; as, to crupper a horse.
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 Crup·per n.  [Written also crouper.]
 1. The buttocks or rump of a horse.
 2. A leather loop, passing under a horse's tail, and buckled to the saddle to keep it from slipping forwards.

 crupper
      n : a strap from the back of a saddle passing under the horse's
          tail; prevents saddle from slipping forward