[n] a light slender flexible sword tipped by a button
[n] a piece of thin and flexible sheet metal; "the photographic film was wrapped in foil"
[n] picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector
[n] 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"
[n] anything that serves by contrast to call attention to another thing's good qualities; "pretty girls like plain friends as foils"
[v] cover or back with foil; "foil mirrors"
[v] hinder or prevent (the efforts, plans, or desires) of; "What ultimately frustrated every challenger was Ruth's amazing September surge"; "foil your opponent"
[v] enhance by contrast; "In this picture, the figures are foiled against the background"
baffle, bilk, cross, enhancer, frustrate, hydrofoil, queer, scotch, spoil, thwart, transparency