Definition of "Plug" :

noun: an old or over-worked horse

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

noun: blockage consisting of an object designed to fill a hole tightly

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

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: blatant or sensational promotion

noun: a wad of something chewable as tobacco

verb: insert as a plug

"She plugged a cork in the wine bottle."

verb: insert a plug into

"Plug the wall."

verb: replace the center of a coin with a baser metal

"Plug a nickle."

verb: persist in working hard

"Students must plug away at this problem."

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

verb: deliver a quick blow to

verb: fill or close tightly with or as if with a plug

"Plug the hole."