That part of an animal that corresponds to the human buttocks(noun)
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Use "croupe" in a sentence
"What the stout old lady who showed us the "relics of old Guy" in 1847 called "Guy's breastplate," and sometimes his helmet! is the "croupe" of"
"He spurred the snorting and reluctant horse into the torrent, though the water, rising high on the upper side, broke both over the pommel and the croupe of his saddle."
"He probably expected me to spring from the ground with the activity which these Borderers have, by constant practice, acquired in everything relating to horsemanship; but as I stood irresolute, he extended his hand, and grasping mine, bid me place my foot on the toe of his boot, and thus raised me in a trice to the croupe of his horse."