[ stee-puh n ]
/ ˈsti pən /
verb (used with or without object)
to make or become steeper.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for steepen
/ (ˈstiːpən) /
to become or cause to become steep or steeper
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