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English definition of “pop-up”

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pop-up

adjective uk   /ˈpɒp.ʌp/ us    /ˈpɑːp-/
used to describe a machine, book, etc. that has parts that push out from a surface or from inside: a pop-up children's book a pop-up toaster used to describe a shop, restaurant, etc. that operates temporarily and only for a short period when it is likely to get a lot of customers

pop-up

noun [C] uk   /ˈpɒp.ʌp/ us    /ˈpɑːp-/

pop-up noun [C] (COMPUTER)

( also pop-up menu) a list of choices that is shown on a computer screen when the user requests it: Select the option you want from the pop-up (menu). a new window that opens quickly on a computer screen in front of what you are working on: software to block pop-ups

pop-up noun [C] (BASEBALL)

( also pop fly) in baseball, a ball that is hit very high in the air but not very far

pop-up noun [C] (SHOP/STORE)

a shop, restaurant, etc. that operates only temporarily for a short period when it is likely to get a lot of customers
(Definition of pop-up adjective, noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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