delve

Short definition from Wiktionary

Verb

1. 1
   To dig into the ground, especially with a shovel.
2. 2
   To search thoroughly and carefully for information, research, dig into, penetrate, fathom, trace out
3. 3
   To dig; to excavate.

Noun

1. 1
   A pit or den.

Proper noun

1. 1
   A surname from Old English.