9 Grammatical Pitfalls


[dee-puh n] /ˈdi pən/
verb (used with object), verb (used without object)
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.
Meteorology. to decrease in atmospheric pressure:
a deepening cyclone.
Origin of deepen
1595-1605; deep + -en1
Related forms
deepener, noun
deepeningly, adverb
overdeepen, verb (used with object)
undeepened, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for deepen
  • 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.
  • Then there is always the possibility that the life will throw light on the books and deepen our understanding of them.
  • To deepen the wound, they had contrasting acting habits.
  • Or use a dark beer instead of the wine to deglaze the pot and deepen the flavor.
  • Until such testing is completed, it seems the intrigue and the accusations will only continue to deepen.
  • The state environment regulator is withholding permission to deepen it.
  • Were deflation to deepen, real interest rates would rise, further hampering economic activity.
British Dictionary definitions for deepen


to make or become deep, deeper, or more intense
Derived Forms
deepener, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for deepen

c.1600, from deep (adj.) + -en (1). Related: Deepened; deepening. The earlier verb had been simply deep, from Old English diepan.

Online Etymology Dictionary, © 2010 Douglas Harper
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