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.

A foil is a very thin sheet of metal, typically made by hammering or rolling. [1][2] Foils are most easily made with malleable metal, such as aluminium, copper, [3] tin, and gold.

FOIL definition: to prevent the success of; frustrate; balk. See examples of foil used in a sentence.

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.

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).

Dec 14, 2025 · foil (countable and uncountable, plural foils) A very thin sheet of metal. (chiefly uncountable) Thin aluminium / aluminum (or, formerly, tin) used for wrapping food. A thin layer …

If you refer to one thing or person as a foil for another, you approve of the fact that they contrast with each other and go well together, often in a way that makes the second thing or person …

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

Look up foil in Wiktionary, the free dictionary.

FOIL definition: 1. metal made into very thin sheets like paper and used mainly for covering food: 2. a person or…. Learn more.