Meanings of croupe in English

Even so, I deny that he could have done that croupe trick.

Fortunately, my Mexican blanket was buckled to the croupe.

The countess rode on horseback, and her female attendant en croupe behind one of the troopers.

Here we have Young Lochinvar swinging the lady to the croupe, and then he springs to the saddle in front of her.

He slipt the girth-buckle, and Rob, dropping down from behind the horse's croupe, dived, swam, and escaped, pretty much as described in the Novel.