foil

US /fɔɪl/
UK /fɔɪl/
"foil" picture
1.

a thin sheet of metal, especially aluminum, used for wrapping food

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Wrap the leftovers tightly in aluminum foil.
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She covered the dish with foil before putting it in the oven.
:
sheetleaflamina
2.

a person or thing that contrasts with and so emphasizes and enhances the qualities of another

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The quiet, thoughtful character served as a perfect foil to the impulsive protagonist.
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His dry wit was a good foil for her exuberant personality.
:
contrastcounterpartcomplementset-off
3.

a light, slender sword with a blunt point, used for fencing

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He practiced his lunges with a fencing foil.
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The fencer saluted with his foil before the match began.
1.

prevent (something undesirable) from succeeding

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The police managed to foil the bank robbery.
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Their plans were foiled by unexpected bad weather.
:
thwartfrustratebaffledefeatcircumventcheckderailhamperhinderimpedeobstructruinspoilstopundoupset
:
aluminium foil