Answer:

coarsen

Answer	Crossword Clue
COARSEN	Make rougher
COARSEN	Make more crude
COARSEN	Make harsh

COARSEN	Make rough
COARSEN	Rough up?
COARSEN	Get tough
COARSEN	Become rough
COARSEN	Turn harsh
COARSEN	Thicken.
COARSEN	Make crude.
COARSEN	Make crude

COARSEN	Debase
COARSEN	Make vulgar
COARSEN	Get callous
COARSEN	Use sandpaper
COARSEN	Become more vulgar
COARSEN	Rough up

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.