Webster's Revised Unabridged Dictionary · 1913

Delve

Delve , transitive verb

[Anglo-Saxon delfan to dig; akin to Old Saxon bidelban to bury, Dutch delven to dig, Middle High German telben, and possibly to English dale. Compare Delf a mine.]

1.
To dig; to open (the ground) as with a spade.
Delve of convenient depth your thrashing floor. — Dryden
2.
To dig into; to penetrate; to trace out; to fathom.
I can not delve him to the root. — Shakespeare

Delve , intransitive verb

To dig or labor with a spade, or as with a spade; to labor as a drudge.
Delve may I not: I shame to beg. — Wyclif (Luke xvi. 3)

Delve , noun

[See Delve, transitive verb, and compare Delf a mine.]

A place dug; a pit; a ditch; a den; a cave.
Which to that shady delve him brought at last.
The very tigers from their delves Look out. — Moore