become obsolete

15 LETTERS · STARTS WITH B

become obsolete is a valid 15-letter word worth 22 points in Scrabble and 27 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
B3E1C3O1M3E1O1B3S1O1L1E1T1E1
3 + 1 + 3 + 1 + 3 + 1 + 0 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 =22 PTS
DOUBLE WORD → 44TRIPLE WORD → 66
MEANING

What does become obsolete mean?

1