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pop-up (EN)
adjective, noun

adjective “pop-up”

base form pop-up, popup, non-gradable
  1. suddenly appearing from a hidden place
    As we walked through the haunted house, a pop-up skeleton scared us at every turn.
  2. becoming three-dimensional when a book page is opened
    The children were delighted by the pop-up dragon that leapt out from their fairy tale book.
  3. existing or functioning for a short time only
    The pop-up cafe on the corner will only be open for the summer.

noun “pop-up”

singular pop-up, popup, plural pop-ups, popups or uncountable
  1. a window that is triggered to appear on a computer screen on top of other content
    While browsing for recipes, a pop-up for kitchen gadgets suddenly appeared on my screen.
  2. a three-dimensional paper design that appears when opening a book or card
    When she opened the birthday card, a colorful pop-up of a cake appeared, surprising her with its intricate details.
  3. a temporary business establishment
    The city's downtown area will host a pop-up selling ice cream this summer.
  4. a ball hit high above the infield or shallow outfield in baseball
    The batter hit a high pop-up, and the shortstop easily caught it for an out.