1. • noun - blockage consisting of an object designed to fill a hole tightly
   • noun - a wad of something chewable as tobacco
   • noun - blatant or sensational promotion
   • noun - electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark
   • noun - an electrical device with two or three pins that is inserted in a socket to make an electrical connection
   • noun - an upright hydrant for drawing water to use in fighting a fire
   • noun - an old or over-worked horse
   • verb - fill or close tightly with or as if with a plug
   • verb - persist in working hard
   • verb - deliver a quick blow to
   • verb - make a plug for
   • verb - insert a plug into
   • verb - insert as a plug
2. • An object, such as a cork or a wad of cloth, used to fill a hole tightly; a stopper.
   • A dense mass of material that obstructs a passage.
   • A usually cylindrical or conic piece cut from something larger, often as a sample.
   • Electricity.
   • A fitting, commonly with two metal prongs for insertion in a fixed socket, used to connect an appliance to a power supply.
   • A spark plug.
   • A hydrant.
   • A flat cake of pressed or twisted tobacco.
   • A piece of chewing tobacco.
   • A mass of igneous rock filling the vent of a volcano.
   • A favorable public mention of a commercial product, business, or performance, especially when broadcast.
   • Something inferior, useless, or defective, especially an old, worn-out horse.
   • A gunshot or bullet: a plug in the back.
   • A lure to which hooks are attached, used especially in angling.
   • To fill (a hole) tightly with or as if with a plug; stop up.
   • To insert (something) as a plug: plugged a cork in the bottle.
   • Slang.
   • To hit with a bullet; shoot.
   • To hit with the fist; punch.
   • To publicize (a product, for example) favorably, as by mentioning on a broadcast: authors who plug their latest books on TV talk shows.
   • To become stopped up or obstructed: alveoli that plug up with phlegm.
   • To work doggedly and persistently: “You may plug along fifty years before you get anywhere” (Saul Bellow).
   • To connect (an appliance) to an electrical outlet.
   • To function by being connected to an electrical outlet: a power drill that plugs in.
   • To connect or be connected to in the manner of an electrical appliance: The local system is plugged into the national telephone network.
   • To cause to be closely attuned or responsive to: connoisseurs who are plugged into the current art scene.
3. • v - to seal or close with a plug (a piece of material used to fill a hole)

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