Synonyms for foil

noun

• 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
• anything that serves by contrast to call attention to another thing's good qualities
• 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
• a piece of thin and flexible sheet metal

verb

• hinder or prevent (the efforts, plans, or desires) of
• cover or back with foil
• enhance by contrast