verb (used with object), verb (used without object)
to make or become steeper.

1840–50; steep1 + -en1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To steepen
World English Dictionary
steepen (ˈstiːpən)
to become or cause to become steep or steeper

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Widespread reactions of this sort could steepen its dive.
Excision of pterygium will steepen the cornea and reduce corneal astigmatism.
For example, following channelization, a stream bed will typically steepen
  upstream and flatten downstream.
However, close proximity of the upper-level cold pool tends to steepen
  mid-level lapse rates, promoting embedded convection.
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