名詞 crupper:

1. a strap from the back of a saddle passing under the horse's tail; prevents saddle from slipping forward

crup.per

n.（名詞）
A leather strap looped under a horse`s tail and attached to a harness or saddle to keep it from slipping forward.
牽鞍兜帶：穿過馬尾下面的一皮革圈套，用來扣緊馬具或馬鞍以防止它向前滑動
The rump of a horse; the croup.
馬臀；四腳動物的臀部

來源：
Middle English crouper
中古英語 crouper
from Old French cropiere
源自 古法語 cropiere
from croupe [rump] * see croup 2
源自 croupe [臀部] *參見 croup2