foil Definition in the Cambridge English Dictionary
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Definition of “foil” - English Dictionary

Definition of "foil" - American English Dictionary

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foilnoun

 us   /fɔɪl/

foil noun (METAL SHEET)

[U] a very ​thinsheet of ​metal, used esp. for ​wrappingfood: aluminum foil

foil noun (COMPARISON)

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

foil noun (BLADE)

[C] a ​thin, ​lightweapon with a ​longblade used in the ​sport of fencing

foilverb [T]

 us   /fɔɪl/

foil verb [T] (PREVENT)

to ​prevent someone or something from being ​successful: An ​attemptedcoup against the country’s ​militaryruler was foiled ​yesterday.

FOILnoun [U]

 us   /fɔɪl/
mathematics abbreviation for first, ​outer, ​inner, last, the ​rule for ​multiplying two binomials (= ​statements that have two ​numbers or ​symbols each)
(Definition of foil from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "foil" - British English Dictionary

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foilnoun

uk   us   /fɔɪl/

foil noun (METAL SHEET)

[U] a very ​thinsheet of ​metal, ​especially used to ​wrapfood in to ​keep it ​fresh: tin foilUK aluminium foil

foil noun (COMPARISON)

[C] something or someone that makes another's good or ​badqualities more ​noticeable: The ​older, ​cynicalcharacter in the ​play is the ​perfect foil for the ​innocent William.

foil noun (SWORD)

[C] a ​thin, ​light sword used in the ​sport of fencing

foilverb [T]

uk   us   /fɔɪl/
to ​prevent someone or something from being ​successful: The ​prisoners' ​attempt to ​escape was foiled at the last ​minute when ​policereceived a ​tip-off.
(Definition of foil from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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