(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.
of or being a device that ejects or raises a finished or used item from the top: a pop-up toaster.
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.
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.
noting or pertaining to a store, restaurant, etc., that temporarily takes over a vacant space and does business there for a short time: a pop-up store selling Halloween costumes.
Computers. appearing suddenly and temporarily in a new window within or on top of an open window: Right-click to get a pop-up menu. There are tools to block pop-up ads.
a pop-up book.
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.
Baseball. pop fly.
a pop-up store, restaurant, etc.
Computers. a pop-up message, menu, etc.: Press the hot key and the pop-up will appear.
Also, popup.

1860–65 for def 9; noun, adj. use of verb phrase pop up

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  (of an appliance) characterized by or having a mechanism that pops up: a pop-up toaster
2.  (of a book) having pages that rise when opened to simulate a three-dimensional form
3.  computing (of a menu on a computer screen, etc) suddenly appearing when an option is selected
4.  (of a shop, restaurant, venue, or other small business) intentionally opening and closing for business within a very short span of time: a pop-up shop
5.  (intr, adverb) to appear suddenly from below
6.  computing something that appears over or above the open window on a computer screen

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Pop-up books have always been the exhibitionists of the literary world-all those creases and protrusions.
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