Definition of afoul adverb from the Oxford Advanced Learner's Dictionary

 

afoul

 adverb
adverb
BrE BrE//əˈfaʊl//
 
; NAmE NAmE//əˈfaʊl//
 
(North American English)
 
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Idioms
run afoul of something
 
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to do something that is not allowed by a law or rule, or to do something that people in authority disapprove of to run afoul of the law
See the Oxford Advanced American Dictionary entry: afoul