Delve
DELVE, verb transitive Delv. [Latin A mole, perhaps the delver.]
1. To dig; to open the ground with a spade.
DELVE of convenient depth your thrashing floor.
2. To fathom; to sound; to penetrate.
I cannot delve him to the root.
DELVE, noun Delv. A place dug: a pit; a pitfall; a ditch; a den; a cave.
DELVE of coals, a quantity of fossil coals dug.