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foil
In a literary or social context, this word describes a strategic contrast. It is not merely about being different, but about acting as a backdrop that makes the primary subject's traits more vivid and apparent. This creates a dynamic where one entity defines the other through opposition.
Countable when referring to a fencing sword or a contrasting person. Uncountable when referring to the metallic material used for wrapping.
Meanings
A thin sheet of metal, typically aluminum, used for wrapping or protection.
"Wrap the leftovers in aluminum foil."
A person or thing that contrasts with another to highlight particular qualities.
"The clumsy sidekick serves as a foil to the hero's competence."