keystone sack

13 LETTERS · STARTS WITH K

keystone sack is a valid 13-letter word worth 25 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

K5E1Y4S1T1O1N1E1S1A1C3K5

5 + 1 + 4 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 3 + 5 =25 PTS

DOUBLE WORD → 50TRIPLE WORD → 75

MEANING

What does keystone sack mean?