plug

An old or over-worked horse

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

Blockage consisting of an object designed to fill a hole tightly

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

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

Blatant or sensational promotion

A wad of something chewable as tobacco

Insert as a plug

“She plugged a cork in the wine bottle”

Insert a plug into

“Plug the wall”

Replace the center of a coin with a baser metal

“Plug a nickle”

Persist in working hard

“Students must plug away at this problem”

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

Deliver a quick blow to

“He punched me in the stomach”

Fill or close tightly with or as if with a plug

“Plug the hole”