Coming into view suddenly from a concealed position. / Opening out to form a three-dimensional structure when the page of a book is opened. / Operating or existing for a brief period only; temporary.

A pop-up advertisement; an advertisement that is triggered to appear on a computer screen when an Internet user accesses a particular web page.

(intransitive) To come up with a "pop" sound. / (intransitive, informal, idiomatic) To appear without warning. / (intransitive) (Of an alert, advertisement, etc.) To suddenly appear onscreen.

plural of pop-up

simple past tense and past participle of pop up

present participle of pop up

Third-person singular simple present indicative form of pop up

(Internet, advertising) An advertisement that takes the form of a window that appears automatically on a computer screen when certain websites are visited.

(graphical user interface) A context menu.

plural of pop-up advertisement