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Verb: pop up
  1. Appear suddenly or unexpectedly
    "He suddenly popped up out of nowhere";
    - crop up, pop
Noun: pop-up  'póp,úp
  1. 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 book
  2. (baseball) a short high fly ball
    - pop fly, pop-fly

Derived forms: pop-ups, popped up, pops up, popping up

Type of: appear, book, fly, fly ball

Encyclopedia: Pop up