bolt from (out of) the blue
An unexpected event that strikes like lightning from the sky: “He had been with the company for eighteen years; when he was fired, it must have felt like a bolt from the blue.”
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The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.