·noun A worthless horse.
II. Plug ·noun A high, tapering silk hat.
III. Plug ·noun A flat oblong cake of pressed tobacco.
IV. Plug ·vt To stop with a plug; to make tight by stopping a hole.
V. Plug ·noun A block of wood let into a wall, to afford a hold for nails.
VI. Plug ·noun Any piece of wood, metal, or other substance used to stop or fill a hole; a stopple.