crupper

[ kruhp-er, kroo p- ]
/ ˈkrʌp ər, ˈkrʊp- /

noun

a leather strap fastened to the saddle of a harness and looping under the tail of a horse to prevent the harness from slipping forward.
the rump or buttocks of a horse.
armor for the rump of a horse.

Origin of crupper

1250–1300; Middle English cro(u)per, variant of cruper < Anglo-French. See croup2, -er2
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Examples from the Web for crupper

British Dictionary definitions for crupper

crupper

/ (ˈkrʌpə) /

noun

a strap from the back of a saddle that passes under the horse's tail to prevent the saddle from slipping forwards
the part of the horse's rump behind the saddle

Word Origin for crupper

C13: from Old French crupiere, from crupe croup ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012