devolve on

VERB
10 LETTERS · STARTS WITH D

devolve on is a valid 10-letter word worth 16 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
D2E1V4O1L1V4E1O1N1
2 + 1 + 4 + 1 + 1 + 4 + 1 + 0 + 1 + 1 =16 PTS
DOUBLE WORD → 32TRIPLE WORD → 48
MEANING

What does devolve on mean?