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English definition of “pop-up”

pop-up

adjective [before noun]     /ˈpɒpʌp/
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 adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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