pop-up

/pop"up'/, adj.

1. (of books, usually children's books) having pieces of artwork fastened to the pages so that when the page is opened, a three-dimensional cutout or object is formed and, sometimes, movement of a picture element, such as a door opening, can be activated by pulling a tab.

2. of or being a device that ejects or raises a finished or used item from the top: a pop-up toaster.

3. of or pertaining to a device, mechanism, or object that rises or pivots from a concealed or recessed position to its operating position: a camera with a pop-up electronic flash; a car with pop-up headlights.

4. popping up, as from an appliance or object: pop-up waffles heated in the toaster; a pop-up gauge for indicating when the turkey is done.

n.

5. a pop-up book.

6. something, as a partially cut out or spring-mounted illustration in a children's book, that unfolds or springs up when opened or otherwise activated; pop-out: a Christmas card with a pop-up of Santa Claus.

7. Baseball. See pop fly.

Also, popup.

[1860-65 for def. 7; n., adj. use of v. phrase pop up]

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