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Definition of foil verb from the Oxford Advanced American Dictionary

 

foil

 verb
verb
NAmE//fɔɪl//
 
[often passive]Verb Forms present simple I / you / we / they foil
 
 he / she / it foils
 
 past simple foiled
 
 -ing form foiling
 
 
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to stop something from happening, especially something illegal; to prevent someone from doing something synonym thwart foil something to foil a plan/crime/plot Customs officials foiled an attempt to smuggle the paintings out of the country. foil somebody (in something) They were foiled in their attempt to smuggle the paintings.
See foil in the Oxford Advanced Learner's Dictionary
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