time and again

ADVERB
14 LETTERS · STARTS WITH T

time and again is a valid 14-letter word worth 16 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
T1I1M3E1A1N1D2A1G2A1I1N1
1 + 1 + 3 + 1 + 0 + 1 + 1 + 2 + 0 + 1 + 2 + 1 + 1 + 1 =16 PTS
DOUBLE WORD → 32TRIPLE WORD → 48
MEANING

What does time and again mean?