Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “foil”

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)
What is the pronunciation of foil?
Add Cambridge dictionaries to your browser to your website

More American English definitions for “foil”

Definitions of “foil” in other dictionaries

Word of the Day

flair

natural ability to do something well

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More