Dictionary definition · plug
noun
- 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
verb
- fill or close tightly with or as if with a plug"plug the hole"
- 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
- replace the center of a coin with a baser metal"plug a nickle"
- insert a plug into"plug the wall"
Source: Open English WordNet (CC BY 4.0).