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general::
noun metal in a thin sheet ADJ. aluminium, gold, silver, tin | kitchen QUANT. piece, sheet | roll VERB + FOIL cover sth with, wrap sth in I wrapped the sandwiches in kitchen foil. sth that shows off the qualities of sth else ADJ. good, ideal, perfect VERB + FOIL be, provide PREP. as a ~ She has used mosses as a foil for the brightly coloured flowers in the bed. | ~ for/to The couple provided the perfect foil for one another.
Oxford Collocations Dictionary