Meaning of “pop up” in the English Dictionary

"pop up" in British English

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pop up

informal
phrasal verb with pop uk /pɒp/ us /pɑːp/ verb -pp-

to appear or happen, especially suddenly or unexpectedly:

She's one of those movie stars who pops up everywhere, on TV, in magazines, on Broadway.
The words "Hard disk failure - program aborted" popped up on the screen.

pop-upadjective

uk /ˈpɒp.ʌp/ us /ˈpɑːp.ʌp/

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-upnoun [ C ]

uk /ˈpɒp.ʌp/ us /ˈpɑːp.ʌp/

(Definition of “pop up” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"pop-up" in Business English

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pop-upnoun [ C ]

uk us

E-COMMERCE, MARKETING an advertisement that is shown in a new window in front of the window that you are looking at on a website:

We do not allow pop-ups of any kind on our website.
Compare

also pop-up menu IT a list of choices that is shown on a computer screen when the user asks for it:

This pop-up can be displayed anywhere on the page with a right-click of the mouse.

pop-upadjective [ before noun ]

uk /ˈpɒpʌp/ us

E-COMMERCE, MARKETING used to describe an advertisement that is shown in a new window in front of the window that you are looking at on a website:

pop-up ads

used to describe something that appears suddenly, and usually exists for a limited time:

At the new pop-up restaurant that has appeared in the neighborhood, diners pay what they think the meal is worth.

(Definition of “pop-up” from the Cambridge Business English Dictionary © Cambridge University Press)