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steepen

[stee-puh n]
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verb (used with or without object)
  1. to make or become steeper.
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Origin of steepen

First recorded in 1840–50; steep1 + -en1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for steepen

steepen

verb
  1. to become or cause to become steep or steeper
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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