<p><strong>Noun</strong></p><ul><li>a piece of wood or other material used to stop up a hole or aperture, to fill a gap, or to act as a wedge.</li><li>a core or interior segment taken from a larger matrix.</li><li>Electricity. a device to which may be attached the conductors of a cord and which by insertion in a jack, or screwing into a receptacle, establishes contact.</li><li>spark plug.</li><li>a fireplug or hydrant.</li><li>a cake of pressed tobacco.</li><li>a piece of tobacco cut off for chewing.</li><li>Informal. the favorable mention of something, as in a lecture, radio show, etc.; advertisement; recommendation: The actress was happy to give her new show a plug.</li><li>Angling. an artificial lure made of wood, plastic, or metal, and fitted with one or more gang hooks, used chiefly in casting.</li><li>Geology. neck.</li><li>Slang. a worn-out or inferior horse.</li><li>Informal. a shopworn or unsalable article.</li><li>a small piece of sod used especially for seeding a lawn.</li><li>a patch of scalp with viable hair follicles that is used as a graft for a bald part of the head.</li><li>Compare hair transplant.</li><li>Slang. punch.</li><li>Metalworking. a mandrel on which tubes are formed.</li><li>a punch on which a cup is drawn.</li><li>a protrusion on a forging die for forming a recess in the work.</li><li>a false bottom on a die.</li><li>a small piece of wood inserted into masonry as a hold for a nail.</li><li>Masonry. plug and feathers.</li><li>Also called dook.</li><li>a man's tall silk hat.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) to stop or fill with or as if with a plug (often followed by up): to plug up a leak; plug a gap.</li><li>to insert or drive a plug into.</li><li>to secure with or as if with a plug.</li><li>to insert (something) as a plug.</li><li>to remove a core or a small plug-shaped piece from.</li><li>to remove the center of (a coin) and replace it with a baser metal: a plugged nickel.</li><li>Informal. to mention (something) favorably, as in a lecture, radio show, etc.: He says he will appear if he can plug his new TV series.</li><li>Slang. to punch with the fist.</li><li>Slang. to shoot or strike with a bullet.</li></ul><p><strong>Verb</strong></p><ul><li>(used without object) plugged, plugging. to work with stubborn persistence (often followed by along or away): You're doing a fine job—just keep plugging.</li><li>Some writers will plug away at the same novel for several years.</li><li>Informal. to publicize insistently: Whenever he gets the chance, he's plugging for his company.</li><li>Slang. to shoot or fire shots.</li></ul><p><strong>Verb Phrase</strong></p><ul><li>to connect to an electrical power source: Plug the TV set in over there.</li><li>Informal. to add or include; incorporate: They still have to plug in more research data.</li><li>to become plugged: The drain in the sink plugs up every so often.</li><li>to connect or become connected by or as if by means of a plug: The device will plug into any convenient wall outlet.</li><li>The proposed new departments would eventually plug into the overall organizational plan.</li><li>Informal. to feel an affinity for; like; understand: Some kids just don't plug into sports in school.</li></ul>