deepen

[dee-puhn]
verb (used with object), verb (used without object)
1.
to make or become deep or deeper: Larger ships will be able to navigate the river after the main channel is deepened. The shadows deepened toward late afternoon.
2.
Meteorology. to decrease in atmospheric pressure: a deepening cyclone.

Origin:
1595–1605; deep + -en1

deepener, noun
deepeningly, adverb
overdeepen, verb (used with object)
undeepened, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deepen (ˈdiːpən)
 
vb
to make or become deep, deeper, or more intense
 
'deepener
 
n

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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Etymonline
Word Origin & History

deepen
c.1600, from deep (adj.). The earlier verb had been simply deep, from O.E. diepan
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It will deepen their understanding of their own problems, and the problems of
  those who are unlike them.
The pair also agreed to an effort to deepen mutual understanding of each
  other's language and culture.
Such liberation of access can only enrich and deepen the historical
  imagination-extending its nourishment to new audiences.
Tyranny was inherently distasteful, but worse than that, dictatorship could
  deepen the opposition and aid the communist cause.
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