The meaning of FOIL is to prevent from attaining an end : defeat. How to use foil in a sentence. Synonym Discussion of Foil.

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.

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

Look up foil in Wiktionary, the free dictionary.

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 meaning: 1 : to prevent (someone) from doing something or achieving a goal defeat often used as (be) foiled; 2 : to prevent (something) from happening or being successful

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.

Aluminium foil (or aluminum foil in American English; also called tinfoil) is aluminium prepared in thin metal leaves. The foil is pliable and can be readily bent or wrapped around objects.

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

Dec 23, 2025 · While it doesn't matter which side of the foil you cook on, there is a reason one side is shiny and the other is dull. Read on to learn more.