plug

PLUG, n. 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, v.t. To stop with a plug; to make tight by stopping a hole.