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English definition of “foil”

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foil

noun  /fɔɪl/ us  

foil noun (METAL SHEET)

[U] a very thin sheet of metal, used esp. for wrapping food: aluminum foil

foil noun (COMPARISON)

[C] someone or something that makes another’s good or bad qualities all the more noticeable: The older, cynical character in the play is the perfect foil for the innocent William.

foil noun (BLADE)

[C] a thin, light weapon with a long blade used in the sport of fencing

foil

verb [T]  /fɔɪl/ us  

foil verb [T] (PREVENT)

to prevent someone or something from being successful: An attempted coup against the country’s military ruler was foiled yesterday.
(Definition of foil noun, verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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