n. A horse kept for riding or driving; a pad; a nag.n. A horse kept for hire; a horse much used; a hack.n. A coach or other carriage kept for hire. Also called hackney-coach.n. A person accustomed to drudgery; a person ready to be hired for any drudgery or dirty work; a hireling.n. A prostitute.n. A payment in hire or as in hire.Let out, employed, or done for hire; drudging; mercenary.To wear, weary, or exhaust by frequent or excessive use, as a horse; hence, to render worn, trite, stale, etc., as by repetition.To ride or drive as a hackney.n. Specifically, a breed of horses which combines thoroughbred blood with that of the English shire horse or cart-horse and also that of the native Irish horse.