brush down

VERB
10 LETTERS · STARTS WITH B

brush down is a valid 10-letter word worth 18 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
B3R1U1S1H4D2O1W4N1
3 + 1 + 1 + 1 + 4 + 0 + 2 + 1 + 4 + 1 =18 PTS
DOUBLE WORD → 36TRIPLE WORD → 54
MEANING

What does brush down mean?