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.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI