• A lever for depressing the sinkers which push the loops down on the needles in a knitting machine.
  • (nautical) A naval ensign flag flown from the main mast, mizzen mast, or the aft-most major mast of (especially) British sailing warships; Union Jack.
  • A jackfruit tree.
  • A compact, portable machine for planing metal.
  • (slang) Money.
  • A hood or other device placed over a chimney or vent pipe, to prevent a back draught.
  • A large California rockfish.
  • A male animal.
  • (nautical) A bar of iron athwart ships at a topgallant masthead, to support a royal mast, and give spread to the royal shrouds; also called jack crosstree.
  • (obsolete) A pitcher or can of waxed leather, supposed to resemble a jackboot; a black-jack.
  • (archaic) A knave (a servant or later, a deceitful man).
  • A device to pull off boots.
  • (sports) A target ball in bowls, etc; a jack-ball.
  • (mining) A wooden wedge for separating rocks rent by blasting.
  • (nautical) A small flag at the bow of a ship.
  • A coarse mediaeval coat of defence, especially one made of leather.
  • A machine for twisting the sliver as it leaves the carding machine.
  • A penny with a head on both sides, used for cheating.
  • A system of gearing driven by a horse power, for multiplying speed.
  • A common name for the freshwater pike, green pike or pickerel.
  • A man or men in general.

    "Every man jack."

  • (obsolete, nautical) A sailor, a jacktar.
  • (card games) The card ranking between the ten and queen of any suit, picturing a knave or prince on its face. In some card games has a value of eleven based on its rank, but in many card games has a value of ten like the ten, queen, and king cards. Also called a knave.
  • In hunting, the pan or frame holding the fuel of the torch used to attract game at night; also, the light itself.
  • Electrical connector in a fixed position (see Gender of connectors and fasteners)
  • A mechanical contrivance, an auxiliary machine, or a subordinate part of a machine.
  • A surface-mounted connector for electrical, especially telecommunications, equipment.

    "telephone jack"

  • A machine for turning a spit; a smokejack.
  • (colloquial, euphemistic) Nothing,

    "You haven't done jack. Get up and get this room cleaned up right now!"

  • A grating to separate and guide the threads in a warping machine; a heck box.
  • (military) A coarse and cheap medieval coat of defense, especially one made of leather.
  • A machine for slicking or pebbling leather.
  • (slang, Appalachians) A smooth often ovoid large gravel or small cobble in a natural water course.
  • A mechanical device used to raise and (temporarily) support a heavy object, e.g. screw jack, scissor jack, hydraulic jack, ratchet jack, scaffold jack.

    "She used a jack to lift her car and changed the tire."

  • In the harpsichord, an intermediate piece communicating the action of the key to the quill; also called hopper.
  • Any marine fish or the species of the Carangidae family.
  • A donkey.
  • Female ended electrical connector (see Electrical connector)
  • (Britain, dialect, obsolete) A drinking measure holding half a pint or, sometimes, a quarter of a pint.
  • Mangifera caesia, related to the mango tree.
  • A sawhorse or sawbuck.
  • (games) A small, six-pointed playing piece used in the game of jacks.


  • (intransitive) To dance by moving the torso forward and backward in a rippling motion.
  • (transitive) To use a jack.

    "He jacked the car up so that he could replace the brake pads."

  • (transitive, colloquial) To steal something, typically an automobile. Shortened form of carjacking.

    "Someone jacked my car last night!"

  • To produce by freeze distillation; to distil (an alcoholic beverage) by freezing it and removing the ice (which is water), leaving the alcohol (which remains liquid).
  • (transitive, slang, baseball) To hit (the ball) hard; especially, to hit (the ball) out of the field, producing a home run.
  • (transitive) To raise or increase.

    "If you want to jack your stats you just write off failures as invalid results."

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