Foil

/fɔɪl/

Meaning & Definition

noun
A thin sheet of metal, typically made of aluminum or tin, used for various purposes including cooking and packaging.
She covered the leftovers with aluminum foil to keep them fresh.
A character in a narrative whose qualities or actions serve to highlight those of another character, often the protagonist.
In the story, the ambitious entrepreneur was the foil to her carefree artist friend.
A weapon consisting of a light, flexible sword having a blunted end, used in fencing.
He trained for years with the foil before entering competitive fencing matches.
verb
To prevent something from being accomplished; to thwart or frustrate.
The security measures in place helped to foil the robbery attempt.
To reflect (light) in an expansive manner, causing a sense of brightness.
The interior designer chose glossy finishes to foil the dim lighting of the room.

Etymology

Middle English, from Old French 'foile', from Latin 'folium' meaning 'leaf'.

Common Phrases and Expressions

foil someone's plans
To prevent someone from achieving their goals.
to foil a plot
To thwart a planned scheme or action.
foil paper
A shiny, thin material often used for wrapping.

Related Words

reflection
The throwing back by a body or surface of light, heat, or sound without absorbing it.
contrast
The state of being strikingly different from something else in juxtaposition or close association.
character
A person in a novel, play, or movie.

Slang Meanings

A person who is easily outsmarted or outdone.
Don't be a foil in this game; think before you act!
Someone who serves to set off another's abilities or characteristics.
She's the perfect foil for the main character, making her strengths even more pronounced.