rough usage

11 LETTERS · STARTS WITH R

rough usage is a valid 11-letter word worth 15 points in Scrabble and 18 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

R1O1U1G2H4U1S1A1G2E1

1 + 1 + 1 + 2 + 4 + 0 + 1 + 1 + 1 + 2 + 1 =15 PTS

DOUBLE WORD → 30TRIPLE WORD → 45

MEANING

What does rough usage mean?