Definitions from Wiktionary (pop up)

▸ verb:  (intransitive) To come up with a "pop" sound.
▸ verb:  (intransitive, informal, idiomatic) To appear without warning.
▸ verb:  (intransitive) (Of an alert, advertisement, etc.) To suddenly appear onscreen.
▸ verb:  (transitive) To display as an alert, advertisement, etc. that suddenly appears on screen.
▸ Also see pop_up


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