come a cropper at English (WD) Of Explained:
Etymology* Possibly from the phrase Inter: term » neck and crop, in which Inter: term » crop may refer to the backside of a horse.
VerbInter: en-verb » head=come a cropper|comes a cropper|coming a cropper|came a cropper
See also* neck and crop
References* Inter: R:BB » S
Translation: et » come a cropper