roughen 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 rough
roughen definition by American Heritage Dictionary
tr. & intr.v. rough·ened, rough·en·ing, rough·ens
To make or become rough.