not catching

12 LETTERS · STARTS WITH N

not catching is a valid 12-letter word worth 19 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
N1O1T1C3A1T1C3H4I1N1G2
1 + 1 + 1 + 0 + 3 + 1 + 1 + 3 + 4 + 1 + 1 + 2 =19 PTS
DOUBLE WORD → 38TRIPLE WORD → 57
MEANING

What does not catching mean?

1