pop-up
noun [ C ]
ukus 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.
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pop-under
IT (also pop-up menu)
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-up
adjective [ 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.