tripping line

13 LETTERS · STARTS WITH T

tripping line is a valid 13-letter word worth 17 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

T1R1I1P3P3I1N1G2L1I1N1E1

1 + 1 + 1 + 3 + 3 + 1 + 1 + 2 + 0 + 1 + 1 + 1 + 1 =17 PTS

DOUBLE WORD → 34TRIPLE WORD → 51

MEANING

What does tripping line mean?