from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An object, such as a cork or a wad of cloth, used to fill a hole tightly; a stopper.
  • n. A dense mass of material that obstructs a passage.
  • n. A usually cylindrical or conic piece cut from something larger, often as a sample.
  • n. Electricity A fitting, commonly with two metal prongs for insertion in a fixed socket, used to connect an appliance to a power supply.
  • n. Electricity A spark plug.
  • n. A hydrant.
  • n. A flat cake of pressed or twisted tobacco.
  • n. A piece of chewing tobacco.
  • n. Geology A mass of igneous rock filling the vent of a volcano.
  • n. Informal A favorable public mention of a commercial product, business, or performance, especially when broadcast.
  • n. Slang Something inferior, useless, or defective, especially an old, worn-out horse.
  • n. Slang A gunshot or bullet: a plug in the back.
  • n. A lure to which hooks are attached, used especially in angling.
  • transitive v. To fill (a hole) tightly with or as if with a plug; stop up.
  • transitive v. To insert (something) as a plug: plugged a cork in the bottle.
  • transitive v. Slang To hit with a bullet; shoot.
  • transitive v. Slang To hit with the fist; punch.
  • transitive v. Informal To publicize (a product, for example) favorably, as by mentioning on a broadcast: authors who plug their latest books on TV talk shows.
  • intransitive v. To become stopped up or obstructed: a gutter that plugged up with leaves.
  • intransitive v. Informal To work doggedly and persistently: "You may plug along fifty years before you get anywhere” ( Saul Bellow).
  • plug in To connect (an appliance) to an electrical outlet.
  • plug in To function by being connected to an electrical outlet: a power drill that plugs in.
  • plug into To connect or be connected to in the manner of an electrical appliance: The local system is plugged into the national telephone network. This computer plugs into a data bank.
  • plug into Slang To cause to be closely attuned or responsive to: connoisseurs who are plugged into the current art scene.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A pronged connecting device which fits into a mating socket.
  • n. Any piece of wood, metal, or other substance used to stop or fill a hole; a stopple.
  • n. A flat oblong cake of pressed tobacco.
  • n. A high, tapering silk hat.
  • n. A worthless horse.
  • n. A block of wood let into a wall to afford a hold for nails.
  • n. A mention of a product (usually a book, film or play) in an interview, or an interview which features one or more of these.
  • n. A body of once molten rock that hardened in a volcanic vent. Usually round or oval in shape.
  • n. A type of lure consisting of a rigid, buoyant or semi-buoyant body and one or more hooks.
  • v. To stop with a plug; to make tight by stopping a hole.
  • v. To blatantly mention a particular product or service as if advertising it.
  • v. (informal) To persist or continue with something.
  • v. To shoot a bullet into something with a gun.
  • v. to have sex with, penetrate sexually.

from the GNU version of the Collaborative International Dictionary of English

  • n. Any piece of wood, metal, or other substance used to stop or fill a hole; a stopple.
  • n. A flat oblong cake of pressed tobacco.
  • n. A high, tapering silk hat.
  • n. A worthless horse.
  • n. A block of wood let into a wall, to afford a hold for nails.
  • transitive v. To stop with a plug; to make tight by stopping a hole.

from The Century Dictionary and Cyclopedia

  • To stop with a plug; make tight by stopping a hole: as, to plug a decayed tooth; to plug a wound with lint.
  • To hit with a ball or bullet: as, to plug a buck with a rifle.
  • To cut out a plug from: said of watermelons when a tapering plug is cut out to see if the fruit is ripe, and then replaced.
  • n. A piece of wood or other substance, usually in the form of a peg or cork, used to stop a hole in a vessel; a stopple; a bung or stopper of any kind.
  • n. A peg, wedge, or other appliance driven in, or used to stop a hole or fill a gap. ,
  • n. A wedge-pin forced between a rail and its chair on a railway.
  • n. A spigot driven into place, as in a barrel, in contradistinction to one screwed in.
  • n. A wooden stopper fitted in the opening of the pump on a ship's deck during a storm, to protect the water-tanks against lightning; a pump-stopper.
  • n. A small piece of some substance, as metallic foil, used by a dentist to fill the cavity of a decayed tooth.
  • n. A branch pipe from a watermain, leading to a point where a hose can be conveniently attached, and closed by a cap or plug; a fire-plug.
  • n. In die-sinking, a cylindrical piece of soft steel the end of which is fitted to a matrix.
  • n. A flat oblong cake of pressed tobacco.
  • n. A man's silk or dress hat; a plug-hat.
  • n. A worn, damaged, unfashionable, or otherwise injured article, which, by reason of its defects, has become undesirable, unsalable, or in a condition rendering it difficult to sell without a large reduction of its price, as a shelf-worn book, or an old horse worn down by hard work. Also old plug.
  • n. A short, thick-set person.
  • n. A workman who has served no regular apprenticeship.
  • n. A sort of fishing-boat.
  • n. Same as plug-rod
  • n. In geology, a cylindrical mass of lava, a remnant of the last eruption from a volcanic vent, which chilled in the conduit and plugged it up. See neck, 6 , and stock, 35.
  • n. A book that does not sell at all.
  • n. In stone-cutting, a wedge which is driven into a hole that has been drilled in a stone for the purpose of splitting it. For large pieces of stone a series of holes is drilled and a wedge or plug driven into each.
  • n. In a steam-engine: A plug-rod; a plug-frame.
  • n. A safety-plug; a fusible plug inserted in a boiler and made of some alloy which will melt if the temperature of the metal plate of the shell rises above a certain point by reason of low water.
  • n. Same as peg, 7.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. insert a plug into
  • n. an upright hydrant for drawing water to use in fighting a fire
  • n. an electrical device with two or three pins that is inserted in a socket to make an electrical connection
  • v. insert as a plug
  • n. an old or over-worked horse
  • v. persist in working hard
  • n. a wad of something chewable as tobacco
  • v. deliver a quick blow to
  • n. electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark
  • n. blockage consisting of an object designed to fill a hole tightly
  • v. make a plug for; praise the qualities or in order to sell or promote
  • v. fill or close tightly with or as if with a plug
  • n. blatant or sensational promotion


Dutch, from Middle Dutch plugge.
(American Heritage® Dictionary of the English Language, Fourth Edition)
1606; from Dutch plug, from Middle Dutch plugge 'peg, plug', from Proto-Germanic *plugjaz (cf. Low German Plüg, German Pflock 'needle', Norwegian plug 'peg, small wedge'); akin to Lithuanian plúkti 'to strike, hew'. (Wiktionary)



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