Pop-up Definition

pŏpŭp
popup, pop-ups
adjective
Emerging quickly from a recessed or concealed position when activated.
Pop-up gun emplacements.
American Heritage
Of or designating a book designed so that cut-out portions of an illustration lift when the book is opened to its page, producing a three-dimensional effect.
Webster's New World
Intended to remain open for business only temporarily.
American Heritage
Emerging quickly from a recessed or concealed position when activated.
Pop-up gun emplacements.
American Heritage
Rising to form a three-dimensional structure when a page is opened.
Pop-up illustrations in a children's book.
American Heritage
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noun
A device or illustration that pops up.
American Heritage
Webster's New World
A webpage or advertisement that opens automatically in a new window of a web browser.
American Heritage
A device or illustration that pops up.
American Heritage
A webpage or advertisement that opens automatically in a new window of a web browser.
American Heritage
Synonyms:
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verb
To come up with a "pop" sound.
The toast is in the toaster - when it pops up it will be ready.
Wiktionary

(idiomatic) To appear without warning.

I can't remember where I left my keys, but they normally pop up somewhere.
Wiktionary
Synonyms:

Other Word Forms of Pop-up

Noun

Singular:
pop-up
Plural:
pop-ups
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