Definition of mill-horse in English:

mill-horse

noun

  • 1A horse used for turning or working a mill.

  • 2Figurative or in extended use. A person or thing resembling a mill-horse, especially in being restricted by choice or circumstance to a monotonous lifestyle or blinkered outlook.

Origin

Late Middle English; earliest use found in Reginald Pecock (c1392–?1459), bishop of Chichester and religious author. From mill + horse.

Pronunciation

mill-horse

/ˈmɪl hɔːs/