(intransitive, colloquial, vulgar) To masturbate.

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

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).

The edible fruit of the Asian tree (Artocarpus heterophyllus); also the tree itself. / The related tree Mangifera caesia.

(slang, baseball) A home run.

(transitive, slang, baseball) To hit (the ball) hard; especially, to hit (the ball) out of the field, producing a home run.

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.