What does the word crupper mean?

Usage examples for crupper

  1. And the result is like that, of the fortunate fights of romance: he thrusts his antagonists straight over the crupper, he sends them rolling on the ground, and clutching its sand with their fingers. – Matthew Arnold by George Saintsbury
  2. Master ran after him, and, being much fleeter, kept on kicking his legs and flanks, so that they were soon covered with blood, and once he kicked so high as to cut the crupper. – Six Months at the Cape by R.M. Ballantyne