Pop-under Definition

pŏpŭndər
noun
A pop-up advertisement that opens behind the active window of a web browser so that the advertisement is not usually seen until the active window is closed.
American Heritage

Other Word Forms of Pop-under

Noun

Singular:
pop-under
Plural:
pop-unders

Origin of Pop-under

  • On the model of pop-up

    From American Heritage Dictionary of the English Language, 5th Edition

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pop-under