A male given name from Hebrew, also used as a pet form of John. / A surname. / (colloquial) Jack Daniel's, a brand of Tennessee whiskey.

(informal) A placeholder or conventional name for any man, particularly a younger, lower-class man. / (informal, archaic) Ellipsis of Jack Tar., a sailor.

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.

present participle of jack

(colloquial) A street robbery.

plural of Jack

A surname originating as a patronymic derived from Jack.

(transitive, idiomatic, Britain) To stop doing a regular activity. Often a job or studies.