Wiktionary
vb. 1 To come up with a "pop" sound. 2 (context idiomatic English) To appear without warning.
WordNet
Wikipedia
Pop-up is the debut studio album by French electropop trio Yelle. It was released on 3 September 2007 by the EMI-owned label Source Etc. The album peaked at number sixty-one in France, where it was certified silver by the Syndicat National de l'Édition Phonographique (SNEP).
Usage examples of "pop up".
Sometimes, however, this lack of caution backfired, because Mercedes would be on all fours hiding behind a lilac bush or some tulips, and she would pop up with her pitching arm going like balls of fire as soon as Harlan entered the invisible but well-marked sphere of her range, and without fail her sudden appearance, plus the accuracy of her pellets, would give the big blubbery man such a start that on several occasions he actually fell down from surprise, and he almost always emerged from these sneak attacks with his heart thundering in a terribly unhealthy manner.
One of them might pop up and I'd miss my jump time just for a silly traffic accident with one of your nobles.
Bomanz watched Men fu pop up to look around, ugly little head jerking like that of a nervous pigeon.
If they have space-time twisters, they can pop up anywhere, steal what they want - or replace a real human with a convincing fake - and be gone like switching off a light.
If they have space-time twisters, they can pop up anywhere, steal what they want -- or replace a real human with a convincing fake -- and be gone like switching off a light.
At nine-thirty, still providing that L-- was given no cause for alarm, we would pick Pop up in an isolated area.
It could pop up on you at any time like a shooting gallery target, only it was the one that was armed.
Behind them the kids crunched on Frito Lays and noisily sucked pop up through peppermint straws.