block off

VERB
9 LETTERS · STARTS WITH B

block off is a valid 9-letter word worth 22 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
B3L1O1C3K5O1F4F4
3 + 1 + 1 + 3 + 5 + 0 + 1 + 4 + 4 =22 PTS
DOUBLE WORD → 44TRIPLE WORD → 66
MEANING

What does block off mean?