break of day

NOUN
12 LETTERS · STARTS WITH B

break of day is a valid 12-letter word worth 23 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
B3R1E1A1K5O1F4D2A1Y4
3 + 1 + 1 + 1 + 5 + 0 + 1 + 4 + 0 + 2 + 1 + 4 =23 PTS
DOUBLE WORD → 46TRIPLE WORD → 69
MEANING

What does break of day mean?