foil Definition

  • 1a very thin sheet of metal, especially used to wrap food in to keep it fresh
  • 2a light fencing sword with a blunted tip
  • 3prevent (something considered wrong or undesirable) from succeeding

Using foil: Examples

Take a moment to familiarize yourself with how "foil" can be used in various situations through the following examples!

  • Example

    She wrapped the sandwich in foil to keep it fresh.

  • Example

    He fenced with a foil in the competition.

  • Example

    The security guard foiled the attempted robbery.

  • Example

    The detective was able to foil the criminal's plan.

foil Synonyms and Antonyms

Synonyms for foil

Antonyms for foil

Phrases with foil

  • thin sheets of aluminum foil used for cooking, baking, and storing food


    She covered the dish with tin foil before putting it in the oven.

  • a hat made of aluminum foil worn by conspiracy theorists to protect their brain from mind control or surveillance


    Some people believe that wearing a foil hat can protect them from government surveillance.

  • a printing process that uses heat, pressure, and a metallic paper (foil) to create shiny designs or lettering on paper or other materials


    The wedding invitations were beautifully decorated with foil stamping.

Origins of foil

from Old French 'foille', meaning 'leaf'


Summary: foil in Brief

The term 'foil' [foil] refers to a thin sheet of metal used for wrapping food, a light fencing sword, or to prevent something from succeeding. It can be used in phrases like 'tin foil' for cooking, 'foil hat' for conspiracy theories, and 'foil stamping' for printing. The verb form means to thwart or prevent something from happening, as in 'The detective was able to foil the criminal's plan.'