coarsen definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
transitive verb, intransitive verb
to make or become coarse
coarsen definition by American Heritage Dictionary
tr. & intr.v. coars·ened, coars·en·ing, coars·ens
To make or become coarse.