Plug

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Plug

(n.) Any piece of wood, metal, or other substance used to stop or fill a hole; a stopple.
(n.) A flat oblong cake of pressed tobacco.
(n.) A high, tapering silk hat.
(n.) A worthless horse.
(n.) A block of wood let into a wall, to afford a hold for nails.
(v. t.) To stop with a plug; to make tight by stopping a hole.