run afoul

VERB
9 LETTERS · STARTS WITH R

run afoul is a valid 9-letter word worth 11 points in Scrabble and 15 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
R1U1N1A1F4O1U1L1
1 + 1 + 1 + 0 + 1 + 4 + 1 + 1 + 1 =11 PTS
DOUBLE WORD → 22TRIPLE WORD → 33
MEANING

What does run afoul mean?

VERB · 1 SENSE