Horse

A hoofed mammal, Equus ferus caballus, often used throughout history for riding and draft work.

Any current or extinct animal of the family Equidae, including the zebra or the ass.

Cavalry soldiers (sometimes capitalized when referring to an official category).

In gymnastics, a piece of equipment with a body on two or four legs, approximately four feet high with two handles on top.

The chess piece representing a knight, depicted as a man in a suit of armor and often on a horse, hence the nickname.

A large person.

A rope stretching along a yard, upon which men stand when reefing or furling the sails; foot ropes.

The sedative, anti-depressant, and anxiolytic drug morphine, chiefly when used illicitly.

An informal variant of basketball in which players match shots made by their opponent(s), each miss adding a letter to the word "horse", with 5 misses spelling the whole word and eliminating a player, until only the winner is left.

Heroin.

To frolic, to act mischieviously. (Usually followed by "around".).

To provide with a horse.

To get on horseback.