[kawr-suhn, kohr-]
verb (used with object), verb (used without object)
to make or become coarse.

1795–1805; coarse + -en1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To coarsen
World English Dictionary
coarsen (ˈkɔːsən)
to make or become coarse

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
Thus his name calling sets an incredibly bad example and only serves to coarsen
Beaches may gradually coarsen, eliminating essential surf smelt spawning
Euhedral pyrite cubes coarsen outward along the edge of the sample suggesting
  open-space growth.
Sediments of the outer shelf tend to coarsen with sporadic outcrops of bedrock.
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