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English definition of “fool's gold”

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fool's gold

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