come out of a/the clear blue sky

come out of a/the clear blue sky

To happen unexpectedly. She seemed so surprised by the news that it must have come out of a clear blue sky. You need to work hard—opportunities don't just come out of the clear blue sky.
See also: blue, clear, come, of, out, sky
Farlex Dictionary of Idioms.

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
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • come out of a clear blue sky
  • come out of the blue
  • appear out of thin air
  • appear, etc. out of thin air
  • as it turned out
  • as it/things turned out
  • be hit for six
  • breeze out
  • dark horse, a
  • a dark horse