extra dash

10 LETTERS · STARTS WITH E

extra dash is a valid 10-letter word worth 20 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

E1X8T1R1A1D2A1S1H4

1 + 8 + 1 + 1 + 1 + 0 + 2 + 1 + 1 + 4 =20 PTS

DOUBLE WORD → 40TRIPLE WORD → 60

MEANING

What does extra dash mean?