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

1625–35; smooth + -en1

unsmoothened, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To smoothen
World English Dictionary
smoothen (ˈsmuːðən)
to make or become smooth

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
They even gave them some money to smoothen the grudges and make them leave faster.
We are looking to smoothen out this, and provide a dedicated lane at this site.
It is simply marvelous to smoothen rough, red hands.
Smoothen both meshes using original parametric descriptions.
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