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3. come out of a clear blue sky

come out of a clear blue sky

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come out of a clear blue sky

 and come out of the clear blue sky; come out of the blue

suddenly; without warning. Then, out of a clear blue sky, he told me he was leaving. My sister Mary appeared on my doorstep out of the blue, after years with no word from her.

See also: blue, clear, come, of, out, sky