[ 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

deep·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 deepened

British Dictionary definitions for deepened


/ (ˈdiːpən) /


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