plug

blockage consisting of an object designed to fill a hole tightly

a wad of something chewable as tobacco

blatant or sensational promotion

electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark

an electrical device with two or three pins that is inserted in a socket to make an electrical connection

an upright hydrant for drawing water to use in fighting a fire

an old or over-worked horse

fill or close tightly with or as if with a plug; "plug the hole"; "stop up the leak"

persist in working hard; "Students must plug away at this problem"

deliver a quick blow to; "he punched me in the stomach"

make a plug for; praise the qualities or in order to sell or promote

insert a plug into; "plug the wall"

insert as a plug; "She plugged a cork in the wine bottle"