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smoothen

[smoo-thuh n]
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verb (used with or without object)
  1. to make or become smooth.
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Origin of smoothen

First recorded in 1625–35; smooth + -en1
Related formsun·smooth·ened, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for smoothen

smoothen

verb
  1. to make or become smooth
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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