slack back

10 LETTERS · STARTS WITH S

slack back is a valid 10-letter word worth 23 points in Scrabble and 27 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1L1A1C3K5B3A1C3K5

1 + 1 + 1 + 3 + 5 + 0 + 3 + 1 + 3 + 5 =23 PTS

DOUBLE WORD → 46TRIPLE WORD → 69

MEANING

What does slack back mean?