A member of Hoo-Hoo.
A jackrabbit.
A large California rockfish, the bocaccio, Sebastes paucispinis.
Mangifera caesia, related to the mango tree.
Any of the marine fish in the family Carangidae.
Nothing, jack shit.
A coarse mediaeval coat of defence, especially one made of leather.
Each of a series of blocks in a harpsichord or the earlier virginal, communicating the action of the key to the quill; sometime also, a hopper in a modern piano.
The eleventh batsman to come to the crease in an innings.
A mechanical device used to raise and (temporarily) support a heavy object, now especially to lift one side of a motor vehicle when (e.g.) changing a tyre.
Any of various levers for raising or lowering the sinkers which push the loops down on the needles in a knitting machine or stocking frame.
The lowest court card in a deck of standard playing cards, ranking between the 10 and queen, with an image of a knave or pageboy on it.
A torch or other light used in hunting to attract or dazzle game at night.
The related tree Mangifera caesia.
Money.
A small, six-pointed playing piece used in the game of jacks.
A small ship's flag used as a signal or identifying device; a small flag flown at the bow of the vessel.
A pitcher or other vessel for holding liquid, especially alcoholic drink; a black-jack.
A sailor.
A lumberjack.
A pike, especially when young.
A sepoy.
A device for turning a spit; a smokejack or roasting jack.
A man, a fellow; a typical man; men in general.
A home run.
A device used to hold a boot by the heel, to assist in removing the boot.
A switch for a jack plug, a jackknife switch; (more generally) a socket used to connect a device to a circuit, network etc.
A small, typically white, ball used as the target ball in bowls; a jack-ball.
Plant of the genus Emex, also considered synonymous to Rumex, if not then containing two species lesser jack and little jack for Emex spinosa syn. Rumex spinosus, Australian English three-corner jack and prickly jack for Emex australis syn. Rumex hypogaeus.
Spadix of a plant (also capitalized Jack).
The edible fruit of the Asian tree (Artocarpus heterophyllus); also the tree itself.
Plant in the genus Arisaema, also known as Jack-in-the-pulpit, and capitalized Jack.
A smooth often ovoid large gravel or small cobble in a natural water course.
A policeman or detective; (Australia) a military policeman.
A name applied to a hypothetical or typical man.
A male ass, especially when kept for breeding.
Tired, disillusioned; fed up (with).
To physically raise using a jack.
To hit (the ball) hard; especially, to hit (the ball) out of the field, producing a home run.
To raise or increase.
To increase the potency of an alcoholic beverage similarly to distillation by chilling it to below the freezing point of water, removing the water ice crystals that form, and leaving the still-liquid alcoholic portion.
To dance by moving the torso forward and backward in a rippling motion.
To steal something, typically an automobile.
To jack off, to masturbate.