tack duty

9 LETTERS · STARTS WITH T

tack duty is a valid 9-letter word worth 18 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

T1A1C3K5D2U1T1Y4

1 + 1 + 3 + 5 + 0 + 2 + 1 + 1 + 4 =18 PTS

DOUBLE WORD → 36TRIPLE WORD → 54

MEANING

What does tack duty mean?