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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.

Look up foil in Wiktionary, the free dictionary.

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).

Reynolds Wrap Non Stick Aluminum Foil, Nonstick Aluminum Foil Roll, Prevents Food Sticking and Messy Cleanup, Great for Covering Casseroles and leftovers, 43.33 Yards x 12 Inches, …

Jan 14, 2026 · foil (countable and uncountable, plural foils) A very thin sheet of metal or plastic. (chiefly uncountable) Thin aluminium / aluminum (or, formerly, tin) used for wrapping food. A …

a person or thing that makes another seem better by contrast: The straight man was an able foil to the comic. Architecture an arc or a rounded space between cusps, as in the tracery of a …

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.

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