"foil" in the noun sense
a piece of thin and flexible sheet metal
"the photographic film was wrapped in foil"
2. foil, enhancer
anything that serves by contrast to call attention to another thing's good qualities
"pretty girls like plain friends as foils"
3. hydrofoil, foil
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. foil, transparency
picture consisting of a positive photograph or drawing on a transparent base viewed with a projector
a light slender flexible sword tipped by a button
"foil" in the verb sense
enhance by contrast
"In this picture, the figures are foiled against the background"
2. thwart, queer, spoil, scotch, foil, 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"
cover or back with foil
Source: WordNet® (An amazing lexical database of English)
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