popping up

Verb

pop up (third-person singular simple present pops up, present participle popping up, simple past and past participle popped up)

1. (intransitive) To come up with a "pop" sound.
   • The toast is in the toaster - when it pops up it will be ready.
2. (idiomatic, informal, intransitive) To appear without warning.
   • I can't remember where I left my keys, but they normally pop up somewhere.
3. (intransitive) (Of an alert, advertisement, etc.) To suddenly appear onscreen.
   • And then up popped on my screen something truly bizarre.
4. (transitive) To display as an alert, advertisement, etc. that suddenly appears on screen.
   • My computer just popped up a warning about Internet security.