1. thin sheets of metal, especially aluminum, used for wrapping or covering
2. people or things that contrast with and emphasize the qualities of another
3. light swords with blunted tips used in fencing
Usage: fencing

1. prevents someone from accomplishing something; thwarts

Examples

• She wrapped the leftovers in aluminum foils.
• The bright flowers served as perfect foils for the dark green leaves.
• The fencing team practiced with their foils every afternoon.
• The detective foils the criminal’s escape plan.
• Heavy rain foils our picnic plans.
• The security system foils attempted break-ins.
• Gold foils decorated the book’s cover.
• Her calm personality foils his nervous energy.