1.a piece of thin and flexible sheet metal;
the photographic film was wrapped in foil
2.anything that serves by contrast to call attention to another thing's good qualities;
pretty girls like plain friends as foils
3.a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through;
the fins of a fish act as hydrofoils
4.picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector
5.a light slender flexible sword tipped by a button
1.enhance by contrast;
In this picture, the figures are foiled against the background
2.hinder or prevent (the efforts, plans, or desires) of;
What ultimately frustrated every challenger was Ruth's amazing September surge
3.cover or back with foil;
foil mirrors