clause boundary

15 LETTERS · STARTS WITH C

clause boundary is a valid 15-letter word worth 22 points in Scrabble and 27 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

C3L1A1U1S1E1B3O1U1N1D2A1R1Y4

3 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 2 + 1 + 1 + 4 =22 PTS

DOUBLE WORD → 44TRIPLE WORD → 66

MEANING

What does clause boundary mean?