horse colt, cuddy or cuddie (dialect, chiefly Scots.) dobbin, filly, gee-gee (slang) gelding, hobby (archaic or dialect) jade, mare, moke (Austral. slang) mount, nag, stallion, steed (archaic or literary) studhorse or stud, yarraman (Austral.) yearling →
sport
horse around , about
clown, fool about or around, misbehave, play the fool, play the goat, roughhouse (slang)
horse sense
common sense, gumption (Brit. informal) judgment, mother wit, nous (Brit. slang) practicality
one-horse
backwoods, inferior, minor, obscure, petty, quiet, sleepy, slow, small, small-time (informal) tinpot (Brit. informal) unimportant