1. an object, such as a cork or a wad of cloth, used to fill a hole tightly; a stopper.
2. A dense mass of material that obstructs a passage.
3. A usually cylindrical or conic piece cut from something larger, often as a sample.
4. electricity A fitting, commonly with two metal prongs for insertion in a fixed socket, used to connect an appliance to a power supply.
5. electricity A spark plug.
6. A hydrant.
7. A flat cake of pressed or twisted tobacco.
8. A piece of chewing tobacco.
9. geology A mass of igneous rock filling the vent of a volcano.
10. informal A favorable public mention of a commercial product, business, or performance, especially when broadcast.
11. slang something inferior, useless, or defective, especially an old, worn-out horse.
12. slang A gunshot or bullet: a plug in the back.
13. A lure to which hooks are attached, used especially in angling.
14. to fill (a hole) tightly with or as if with a plug; stop up.
15. to insert (something) as a plug: plugged a cork in the bottle.
16. slang to hit with a bullet; shoot.
17. slang to hit with the fist; punch.
18. informal to publicize (a product, for example) favorably, as by mentioning on a broadcast: authors who plug their latest books on tv talk shows.
19. to become stopped up or obstructed: a gutter that plugged up with leaves.
20. informal to work doggedly and persistently: "you may plug along fifty years before you get anywhere” ( Saul bellow).
21. plug in to connect (an appliance) to an electrical outlet.
22. plug in to function by being connected to an electrical outlet: a power drill that plugs in.
23. 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.
24. plug into slang to cause to be closely attuned or responsive to: connoisseurs who are plugged into the current art scene.

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

1. any piece of wood, metal, or other substance used to stop or fill a hole; a stopple.
2. A flat oblong cake of pressed tobacco.
3. A high, tapering silk hat.
4. A worthless horse.
5. A block of wood let into a wall, to afford a hold for nails.
6. to stop with a plug; to make tight by stopping a hole.

1. to stop with a plug; make tight by stopping a hole: as, to plug a decayed tooth; to plug a wound with lint.
2. to hit with a ball or bullet: as, to plug a buck with a rifle.
3. 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.
4. 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.
5. A peg, wedge, or other appliance driven in, or used to stop a hole or fill a gap. ,
6. A wedge-pin forced between a rail and its chair on a railway.
7. A spigot driven into place, as in a barrel, in contradistinction to one screwed in.
8. 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.
9. A small piece of some substance, as metallic foil, used by a dentist to fill the cavity of a decayed tooth.
10. 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.
11. in die-sinking, a cylindrical piece of soft steel the end of which is fitted to a matrix.
12. A flat oblong cake of pressed tobacco.
13. A man's silk or dress hat; a plug-hat.
14. 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.
15. A short, thick-set person.
16. A workman who has served no regular apprenticeship.
17. A sort of fishing-boat.
18. same as plug-rod
19. 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.
20. A book that does not sell at all.
21. 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.
22. in a steam-engine: A plug-rod; a plug-frame.
23. 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.
24. same as peg, 7.

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