Definition of "pop-up" []

• Emerging quickly from a recessed or concealed position when activated: pop-up gun emplacements. (adjective)
• Rising to form a three-dimensional structure when a page is opened: pop-up illustrations in a children's book. (adjective)
• A device or illustration that pops up. (noun)
• Baseball See pop fly. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A long-term pop-up, this store will be open for a year, featuring products from SLVR and Y-3, and adidas Originals' BLUE and Consortium."
• "Toyota showed what is called a pop-up hood, which rises slightly in a crash, to mitigate the impact of a pedestrian getting hit by a car, similar to features offered by European makers."
• "We have what is called a pop-up camper, although it doesn’t pop up."