verb (used with object), verb (used without object)
to make or become rough or rougher.

1580–90; rough + -en1

roughener, noun
unroughened, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
roughen (ˈrʌfən)
to make or become rough

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
After the first coat hardens approximately one hour, the surface is scratched
  with the edge of the trowel to roughen it.
Roughen surface of each layer to provide key for the next.
Prior to application, roughen embankment and fill areas by rolling with a
  crimping or punching type roller or by track walking.
The purpose of abrading is to roughen the surface, not to remove a significant
  amount of galvanizing.
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