Definition of "mouseover" [mouseover]

• The event of an on-screen pointer being over an on-screen shape. (noun)

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• "An Australian teenager has become an overnight Internet celebrity for admitting that he was the mastermind behind the "mouseover" attack that led to Tuesday's Twitter ..."
• "An Australian teenager has become an overnight Internet celebrity for admitting that he was the mastermind behind the "mouseover" attack that led to Tuesday's Twitter mayhem."
• "It's called a "mouseover", and it requires FOUR LINES of coding, people."