noun
a fencing sword with a light, flexible blade
verb
prevent (something considered wrong or undesirable) from succeeding
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The chef wrapped the fish in foil before placing it in the oven.
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Don't forget to cover the leftovers with foil before putting them in the fridge.
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I used some foil to wrap up my sandwich for later.
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His calm demeanor was the perfect foil to her anxiousness.