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To appear without warning
“Rain is expected to pop up on Wednesday afternoon as a warm front arrives from the south.”
To emerge by means of an upward movement
To stand erect or upright
To go somewhere, typically with some degree of difficulty
To pop out or push up, such as from a surface
To elevate or extend in an upward direction or motion
An advertisement that takes the form of a window that appears automatically on a computer screen when certain websites are visited
A window that prompts the user to enter information
Baseball hit high in the air
Operated using springs
Three-dimensional in nature
Of a computer menu, opening downward to reveal a list of possible options
Acting in a provisional or interim capacity
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