verb (used without object), delved, delving.
to carry on intensive and thorough research for data, information, or the like; investigate: to delve into the issue of prison reform.
Archaic. to dig, as with a spade.
verb (used with object), delved, delving.
Archaic. to dig; excavate.

before 900; Middle English delven, Old English delfan; cognate with Dutch delven, Old High German telban

delver, noun
undelved, adjective

1. research, inquire, probe, examine, explore. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
delve (dɛlv)
1.  to inquire or research deeply or intensively (for information, etc): he delved in the Bible for quotations
2.  to search or rummage (in a drawer, the pockets, etc)
3.  (esp of an animal) to dig or burrow deeply (into the ground, etc)
4.  archaic, dialect or (also tr) to dig or turn up (earth, a garden, etc), as with a spade
[Old English delfan; related to Old High German telban to dig, Russian dolbit to hollow out with a chisel]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. delfan "to dig" (class III strong verb; past tense dealf, pp. dolfen), common W.Gmc. verb with cognates in Slavic. Weak inflections emerged 14c.-16c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Geologists delve into their prehistoric records.
His dry, precisely enunciated singing doesn't delve into the psychological murk
  of lyrics.
In a way, if you delve deep enough into history, you can study just about
  anything under its umbrella.
So I really had to delve into their characters to create a unique voice for
  each of them.
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