working line

12 LETTERS · STARTS WITH W

working line is a valid 12-letter word worth 19 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

W4O1R1K5I1N1G2L1I1N1E1

4 + 1 + 1 + 5 + 1 + 1 + 2 + 0 + 1 + 1 + 1 + 1 =19 PTS

DOUBLE WORD → 38TRIPLE WORD → 57

MEANING

What does working line mean?