fixed idea

10 LETTERS · STARTS WITH F

fixed idea is a valid 10-letter word worth 21 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

F4I1X8E1D2I1D2E1A1

4 + 1 + 8 + 1 + 2 + 0 + 1 + 2 + 1 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does fixed idea mean?