American Dictionary of the English Language

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PLUG, noun A stopple; any piece of pointed wood or other substance used to stop a hole, but larger than a peg or spile.

Hawse-plug, in marine affairs, a plug to stop a hawse-hole.

Shot-plug, a plug to stop a breach made by a cannon ball in the side of a ship.

PLUG, verb transitive To stop with a plug; to make tight by stopping a hole.