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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. 2017.
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Examples from the Web for deepened
Contemporary Examples
Historical Examples
  • For more than an hour, there was perfect stillness, as the shades of evening deepened.

    Philothea Lydia Maria Child
  • Sidney, as tender as ever, had lost a little of the radiance from her eyes; her voice had deepened.

    K Mary Roberts Rinehart
  • With deepened discomfort, Martin hurried to the creek to water the horses.

    Dust Mr. and Mrs. Haldeman-Julius
  • The gloomier colourings of his mind had been deepened, too, by secret remorse.

    Leila, Complete Edward Bulwer-Lytton
  • Vere felt that somehow her eager suggestion had deepened the constraint.

    A Spirit in Prison Robert Hichens
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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