Definitions of pop-up
  1. noun
    a short high fly ball
    synonyms: pop fly, pop-fly
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    type of:
    fly, fly ball
    (baseball) a hit that flies up in the air
  2. noun
    a book (usually for children) that contains one or more pages such that a three-dimensional structure rises up when a page is opened
    synonyms: pop-up book
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    type of:
    a written work or composition that has been published (printed on pages bound together)
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