stash away

VERB
10 LETTERS · STARTS WITH S

stash away is a valid 10-letter word worth 18 points in Scrabble and 16 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1T1A1S1H4A1W4A1Y4
1 + 1 + 1 + 1 + 4 + 0 + 1 + 4 + 1 + 4 =18 PTS
DOUBLE WORD → 36TRIPLE WORD → 54
MEANING

What does stash away mean?