a large, solid-hoofed, herbivorous quadruped, Equus caballus, domesticated since prehistoric times, bred in a number of varieties, and used for carrying or pulling loads, for riding, and for racing.

a fully mature male animal of this type; stallion.

any of several odd-toed ungulates belonging to the family Equidae, including the horse, zebra, donkey, and ass, having a thick, flat coat with a narrow mane along the back of the neck and bearing the weight on only one functioning digit, the third, which is widened into a round or spade-shaped hoof.

something on which a person rides, sits, or exercises, as if astride the back of such an animal

rocking horse.

Also called trestle. a frame, block, etc., with legs, on which something is mounted or supported.

Gymnastics .

vaulting horse.

pommel horse.

Carpentry . carriage ( def. 7 ) .

soldiers serving on horseback; cavalry

a thousand horse.

Slang . a man; fellow.

Often, horses. Informal . horsepower.

horses, Slang . the power or capacity to accomplish something, as by having enough money, personnel, or expertise

Our small company doesn't have the horses to compete against a giant corporation.

Chess Informal . a knight.

Slang . a crib, translation, or other illicit aid to a student's recitation; trot; pony.

Mining . a mass of rock enclosed within a lode or vein.

Nautical . traveler ( def. 6b ) .

Shipbuilding . a mold of a curved frame, esp. one used when the complexity of the curves requires laying out at full size.

Slang . heroin.

to provide with a horse or horses.

to set on horseback.

to set or carry on a person's back or on one's own back.

Carpentry . to cut notches for steps into (a carriage beam).

to move with great physical effort or force

It took three men to horse the trunk up the stairs.

Slang .

to make (a person) the target of boisterous jokes.

to perform boisterously, as a part or a scene in a play.

Nautical .

to caulk (a vessel) with a hammer.

to work or haze (a sailor) cruelly or unfairly.

Archaic . to place (someone) on a person's back, in order to be flogged.

to mount or go on a horse.

(of a mare) to be in heat.

Vulgar . to have coitus.

of, for, or pertaining to a horse or horses

the horse family; a horse blanket.

drawn or powered by a horse or horses.

mounted or serving on horses

horse troops.

unusually large. ?

horse around, Slang . to fool around; indulge in horseplay. ?

back the wrong horse, to be mistaken in judgment

esp. in backing a losing candidate.

beat or flog a dead horse, to attempt to revive a discussion, topic, or idea that has waned, been exhausted

or proved fruitless.

from the horse's mouth

Informal . on good authority; from the original or a trustworthy source

I have it straight from the horse's mouth that the boss is retiring.

hold one's horses

Informal . to check one's impulsiveness; be patient or calm

Hold your horses! I'm almost ready.

horse of another color, something entirely different. Also

horse of a different color.

look a gift horse in the mouth

to be critical of a gift.

To horse! Mount your horse! Ride!