Pop-Up definition

Pop-Up

Topics Pop-Up Definition

WordNet

(1) A short high fly ball

(2) A book (usually for children) that contains one or more pages such that a three-dimensional structure rises up when a page is opened

WiktionaryText

coming into view suddenly from a concealed position
opening out to form a three-dimensional structure when the page of a book is opened

Something that pops up.
A pop-up advertisement; an advertisement that is triggered to appear on a computer screen when an internet user accesses a particular web page.
A ball that has been hit to a considerable height above the infield or the shallow outfield; a pop fly.