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English Dictionary

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 pop-up pop-up /ˈpɒpˌʌp/

noun

  1. (baseball) a short high fly ball  ( pop-fly , pop-up , pop fly )
    (baseball) a short high fly ball
  2. A book (usually for children) that contains one or more pages such that a three-dimensional structure rises up when a page is opened  ( pop-up , pop-up book )
    a book (usually for children) that contains one or more pages such that a three-dimensional structure rises up when a page is opened