frustrate, thwart, foil, baffle, balk mean to check or defeat another's plan or block achievement of a goal. frustrate implies making vain or ineffectual all efforts however vigorous or persistent.

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One that stands in contrast to and emphasizes the distinctive characteristics of another: "I am resolved my husband shall not be a rival, but a foil to me" (Charlotte Brontë).

FOIL definition: 1. a very thin sheet of metal, especially used to wrap food in to keep it fresh: 2. a piece of a…. Learn more.

Durable, Tear-Resistant, Heat-Safe Industrial Foil Roll.

Look up foil in Wiktionary, the free dictionary.

Apr 22, 2026 · foil (third-person singular simple present foils, present participle foiling, simple past and past participle foiled) To prevent (something) from being accomplished.

As a verb, if you foil someone's plans or attempts to do something, you cause them to fail. Your brother will be really mad if you foil his plans to hide his mediocre report card from your parents.

Definition of foil noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

If you foil someone's plan or attempt to do something, for example to commit a crime, you succeed in stopping them from doing what they want.