come out of a blue sky

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come out of a blue sky

To happen or appear completely unexpectedly. A variant of the more common phrases "come out of the blue" and "come out of the clear blue sky." The news really came out of a blue sky for us, so we did not know how to handle it at first. You need to work hard—opportunities don't just come out of a blue sky, you know.
See also: blue, come, of, out, sky
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.