[ 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.

Nearby words

  1. deep-seated,
  2. deep-set,
  3. deep-six,
  4. deep-vein thrombosis,
  5. deep-voiced,
  6. deepfreeze,
  7. deeply,
  8. deepwater,
  9. deer,
  10. deer fern

Origin of deepen

First recorded in 1595–1605; deep + -en1

Related formsdeep·en·er, noundeep·en·ing·ly, adverbo·ver·deep·en, verb (used with object)un·deep·ened, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for deepen

British Dictionary definitions for deepen


/ (ˈdiːpən) /


to make or become deep, deeper, or more intense
Derived Formsdeepener, 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

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