Definition of red horse in US English:

red horse

noun

North American
  • 1Any of various North American suckers (freshwater fishes of the family Catostomidae), of the genus Moxostoma or related genera, having the lower fins (and often the dorsal fin and tail) bright red or orange. Frequently with distinguishing word.

  • 2United States regional (southern). The red drum, Sciaenops ocellatus. rare.

  • 3Slang (originally Military). Corned beef.

Origin

Late 18th century; earliest use found in Benjamin Hawkins (1754–1818). From red + horse.

Pronunciation

red horse

/ˈrɛd ˌhɔːs/