foil Meaning in the Cambridge English Dictionary Cambridge dictionaries logo

Meaning of “foil” in the English Dictionary

(Definition of foil from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"foil" in American English

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 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)
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