What is "came a cropper"

Usage examples of "came a cropper".

Horriston was once a bona fide doctor, but he came a cropper of some kind.

Often, too, he came a cropper on some of his more ambitious maneuvers.

When he did, he craned his neck out so far to be sure it was the kit that he almost came a cropper in the hedge.

If she came a cropper with this Lord Gaebril who had suddenly appeared in Caemlyn, it was no longer any concern of his.