discolorize

VERB
11 LETTERS · STARTS WITH D

discolorize is a valid 11-letter word worth 23 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
D2I1S1C3O1L1O1R1I1Z10E1
2 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 10 + 1 =23 PTS
DOUBLE WORD → 46TRIPLE WORD → 69
MEANING

What does discolorize mean?