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pop up

informal phrasal verb with pop
 
/pɒp/
 
US  /pɑːp/ verb (-pp-)

Definition

to appear or happen, especially suddenly or unexpectedly: She's one of those film stars who pops up everywhere, on TV, in magazines, on Broadway. The words 'Hard disk failure - program aborted' popped up on the screen.Appearing and disappearing
(Definition of pop up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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