prevent (something considered wrong or undesirable) from succeeding

a brave policewoman foiled the armed robbery

the track or scent of a hunted animal

a setback in an enterprise; a defeat

metal hammered or rolled into a thin flexible sheet, used chiefly for covering or wrapping food

aluminium foil

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

his white cravat was a perfect foil for his bronzed features

a leaf-shaped curve formed by the cusping of an arch or circle

a light, blunt-edged fencing sword with a button on its point

each of the structures fitted to a hydrofoil's hull to lift it clear of the water at speed