Definition of road horse in US English:

road horse

noun

  • A horse suitable for use on roads, in later use typically one capable of speed when pulling a light carriage; a roadster.

Origin

Old English (in an earlier sense). Cognate with or formed similarly to Old High German reitros from the Germanic base of Old English rād riding + the Germanic base of horse.

Pronunciation

road horse

/ˈrəʊd hɔːs/