stop the presses

Originally referred to delaying the printing of a newspaper in order to change its content to accommodate the inclusion of late-breaking news.

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stop the presses (third-person singular simple present stops the presses, present participle stopping the presses, simple past and past participle stopped the presses)

1. (idiomatic) An exclamation used to introduce especially new, important, surprising, or recent developments.

• hold the phone
• stop press