last shift

10 LETTERS · STARTS WITH L

last shift is a valid 10-letter word worth 15 points in Scrabble and 15 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

L1A1S1T1S1H4I1F4T1

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

DOUBLE WORD → 30TRIPLE WORD → 45

MEANING

What does last shift mean?