/ Dictionary / Index C crupper: Meaning and Definition of Find definitions for: crup•per Pronunciation: (krup'ur, kroop'-), [key] — n. 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. See illus. under the rump or buttocks of a horse. armor for the rump of a horse. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: crupper (Thesaurus) cruor crural Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language