pop-up - definition and synonyms

noun [countable] 

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singularpop-up
pluralpop-ups
  1. 1
    computing something such as an advertisement that appears suddenly on a computer screen when you are looking at the Internet, or when you click the mouse or press a key
  2. 2
    a restaurant, shop, gallery etc that opens for a short time, sometimes in a surprising location

    The key to any good pop-up is a sense of unpredictability and theatre.