Definition of pop-under in English:

pop-under

Syllabification: pop-un·der

Entry from US English dictionary

adjective

Computing
  • Relating to, or denoting an additional window, usually an advertisement, that is under a web browser’s main or current window and appears when a user tries to exit.

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Word of the day kerf
Pronunciation: kəːf
noun
a slit made by cutting with a saw