reason behind

13 LETTERS · STARTS WITH R

reason behind is a valid 13-letter word worth 18 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

R1E1A1S1O1N1B3E1H4I1N1D2

1 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 4 + 1 + 1 + 2 =18 PTS

DOUBLE WORD → 36TRIPLE WORD → 54

MEANING

What does reason behind mean?