#1 foil n. a piece of thin and flexible sheet metal; "the photographic film was wrapped in foil". wn
#2 foil v. enhance by contrast; "In this picture, the figures are foiled against the background". wn
#3 foil v. [thwart, queer, spoil, scotch, cross, frustrate, baffle, bilk] hinder or prevent (the efforts, plans, or desires) of; "What ultimately frustrated every challenger was Ruth's amazing September surge"; "foil your opponent". wn
#4 foil n. [enhancer] anything that serves by contrast to call attention to another thing's good qualities; "pretty girls like plain friends as foils". wn
#5 foil n. [hydrofoil] 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". wn
vizzz