building line

13 LETTERS · STARTS WITH B

building line is a valid 13-letter word worth 16 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

B3U1I1L1D2I1N1G2L1I1N1E1

3 + 1 + 1 + 1 + 2 + 1 + 1 + 2 + 0 + 1 + 1 + 1 + 1 =16 PTS

DOUBLE WORD → 32TRIPLE WORD → 48

MEANING

What does building line mean?