coarsen

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

Origin:
1795–1805; coarse + -en1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coarsen (ˈkɔːsən)
 
vb
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
  discourse.
Beaches may gradually coarsen, eliminating essential surf smelt spawning
  substrate.
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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