'Crupper' definitions:

Definition of 'crupper'

From: WordNet
noun
A strap from the back of a saddle passing under the horse's tail; prevents saddle from slipping forward

Definition of 'Crupper'

From: GCIDE
  • Crupper \Crup"per\ (kr?p"p?r in U.S.; kr?p"?r in Eng.), n. [F. croupi?re, fr. croupe. See Croup the rump of a horse.] [Written also crouper.]
  • 1. The buttocks or rump of a horse. [1913 Webster]
  • 2. A leather loop, passing under a horse's tail, and buckled to the saddle to keep it from slipping forwards. [1913 Webster]

Definition of 'Crupper'

From: GCIDE
  • Crupper \Crup"per\, v. t. To fit with a crupper; to place a crupper upon; as, to crupper a horse. [1913 Webster]

Synonyms of 'crupper'

From: Moby Thesaurus