deepening

deepen

[dee-puhn]
verb (used with object), verb (used without object)
1.
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.
2.
Meteorology. to decrease in atmospheric pressure: a deepening cyclone.

Origin:
1595–1605; deep + -en1

deepener, noun
deepeningly, adverb
overdeepen, verb (used with object)
undeepened, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deepen (ˈdiːpən)
 
vb
to make or become deep, deeper, or more intense
 
'deepener
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

deepen
c.1600, from deep (adj.). The earlier verb had been simply deep, from O.E. diepan
Online Etymology Dictionary, © 2010 Douglas Harper
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