(1):

(n.) A block of wood let into a wall, to afford a hold for nails.

(2):

(n.) A worthless horse.

(3):

(n.) A flat oblong cake of pressed tobacco.

(4):

(v. t.) To stop with a plug; to make tight by stopping a hole.

(5):

(n.) A high, tapering silk hat.

(6):

(n.) Any piece of wood, metal, or other substance used to stop or fill a hole; a stopple.