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English definition of “foil”

foil

noun [C] (COMPARISON)    /fɔɪl/
something or someone that makes another's good or bad qualities more noticeable: The older, cynical character in the play is the perfect foil for the innocent William.Useful or advantageous
(Definition of foil noun (COMPARISON) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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