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[dee-puh n] /ˈdi pən/
verb (used with or 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. 2016.
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Examples from the Web for deepened
Contemporary Examples
Historical Examples
  • For the girls color had deepened as her visitor laid a bunch of violets on her lap.

  • Instead, it deepened to a steady roar, growing every instant louder.

    Brand Blotters William MacLeod Raine
  • "Eugenically Speaking" could certainly bear no further extension, unless its mood were deepened into seriousness.

  • As the winter deepened, Larmy and the reporter and the "father" had more and more converse.

    In Our Town William Allen White
  • And the years passed on, and every year deepened and strengthened their love.

    We Two Edna Lyall
British Dictionary definitions for deepened


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 deepened



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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