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The Collaborative International Dictionary
Roach-backed

Roach-backed \Roach"-backed`\, a. Having a back like that of roach; -- said of a horse whose back a convex instead of a concave curve.

Wiktionary
roach-backed

a. (context of a horse English) Having a convex back rather than a concave one.

Usage examples of "roach-backed".

They were spindly-legged beasts, many of them roach-backed, the spine curving upwards thus making them uncomfortable to ride.