sound line

10 LETTERS · STARTS WITH S

sound line is a valid 10-letter word worth 10 points in Scrabble and 14 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1O1U1N1D2L1I1N1E1

1 + 1 + 1 + 1 + 2 + 0 + 1 + 1 + 1 + 1 =10 PTS

DOUBLE WORD → 20TRIPLE WORD → 30

MEANING

What does sound line mean?