American English

Definition of foil verb from the Oxford Advanced American Dictionary



    [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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  1. 1to stop something from happening, especially something illegal; to prevent someone from doing something synonym thwart
  2. 2 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 the Oxford Advanced Learner's Dictionary entry: foil

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