Pronunciation: /fɔɪl/
noun a fencing sword with a light, flexible blade
A1 I wrapped my sandwich in foil to keep it fresh for lunch.
A2 The detective found a piece of foil at the crime scene.
B1 She used a foil to cover her hair while dyeing it.
B2 The artist used a foil to create a textured effect in the painting.
C1 The spy used a foil to deceive his enemies and gather information.
C2 The foil in the play served as a contrast to the main character's personality.
verb prevent (something considered wrong or undesirable) from succeeding
A1 I use aluminum foil to wrap my sandwiches for lunch.
A2 She tried to foil the thief's plan by calling the police.
B1 The detective was able to foil the criminal's escape attempt.
B2 The security measures in place helped foil the terrorist attack.
C1 The team's strategic planning successfully foiled their opponents' tactics.
C2 The spy managed to foil the enemy's espionage operation.
formal The chef wrapped the fish in foil before placing it in the oven.
informal Don't forget to cover the leftovers with foil before putting them in the fridge.
slang I used some foil to wrap up my sandwich for later.
figurative His calm demeanor was the perfect foil to her anxiousness.
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