n 1: a piece of thin and flexible sheet metal; "the photographic
film was wrapped in foil"
2: 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"
3: picture consisting of a positive photograph or drawing on a
transparent base; viewed with a projector [syn: transparency
4: a light slender flexible sword tipped by a button
v 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"; "foil your opponent" [syn: thwart
3: cover or back with foil; "foil mirrors"