plug

An old or over-worked horse.

Blockage consisting of an object designed to fill a hole tightly.

Blatant or sensational promotion.

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

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.

A wad of something chewable as tobacco.

Persist in working hard.

“Students must plug away at this problem”

Insert a plug into.

“plug the wall”

Insert as a plug.

“She plugged a cork in the wine bottle”

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”

Deliver a quick blow to.

Fill or close tightly with or as if with a plug.

“plug the hole”