(1):

(v. t.) To dig; to open (the ground) as with a spade.

(2):

(v. i.) To dig or labor with a spade, or as with a spade; to labor as a drudge.

(3):

(v. t.) To dig into; to penetrate; to trace out; to fathom.

(4):

(v. t.) A place dug; a pit; a ditch; a den; a cave.