plural of jack / (poker slang) A pair of jacks. / (UK, rhyming slang) Heroin tablets (from "jacks and jills" = pills)

(slang, now chiefly Ireland) Alternative form of jakes: an outhouse or lavatory.

(games) A children's game involving picking up objects; knucklebones; jackstones.

plural of Jack

A surname originating as a patronymic derived from Jack.

Third-person singular simple present indicative form of jack in

A coarse mediaeval coat of defence, especially one made of leather.

(chiefly capitalized) A name applied to a hypothetical or typical man. / (countable, now chiefly US) A man, a fellow; a typical man; men in general. / (colloquial) A sailor.

(transitive) To physically raise using a jack. / (transitive) To raise or increase.

(Australia) Tired, disillusioned; fed up (with).