swayback

[swey-bak]Veterinary Pathology

noun

an excessive downward curvature of the spinal column in the dorsal region, especially of horses.

adjective

swaybacked.

Origin of swayback

An Americanism dating back to 1865–70; sway + back¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for swayback

Historical Examples of swayback

A man well advanced in years dismounted from a swayback horse at the gate, threw a plow point on the ground and came forward.
Up Terrapin River
Opie P. Read
It was a nuisance to have to keep an eye on the vicious heels of Baldy, the swayback gelding at his left—that was all.
McClure's Magazine, Vol. XXXI, No. 6, October, 1908
Various