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English definition of “fool's gold”

fool's gold

noun [U] uk   /ˌfuːlzˈɡəʊld/ us    /-ˈɡoʊld/
a mineral that is found in rocks and looks like gold but is not worth anythingMineralogy something that you think will be very pleasant or successful but is notFailuresAccidents and disastersHigher and lower points of achievement
(Definition of fool's gold from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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