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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
First recorded in 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. 2018.
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Examples from the Web for deepen
Contemporary Examples
Historical Examples
  • And a second and a third month may only deepen the sense of ignorance and unfitness.

  • Somehow this fact did not tend to deepen Sears Kendrick's affection for them.

    Fair Harbor

    Joseph Crosby Lincoln
  • Her face was very grave and the lines about her mouth seemed to deepen.

    Keziah Coffin Joseph C. Lincoln
  • Bishop's great face seemed to swell and its high colour to deepen.

    Captain Blood Rafael Sabatini
  • The enthusiasm of all around only served to increase and deepen my depression.

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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