(1):

(n.) A sharper or pickpocket.

(2):

(n.) The orifice in the bilge of a cask through which it is filled; bunghole.

(3):

(n.) The large stopper of the orifice in the bilge of a cask.

(4):

(v. t.) To stop, as the orifice in the bilge of a cask, with a bung; to close; - with up.