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out of the blue

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out of the blue

also out of a clear blue sky

happening suddenly and unexpectedly Then one day, completely out of the blue, I had a letter from her. The attack came out of a clear blue sky.

Related vocabulary: out of thin air

See also: blue, of, out

out of the blue

  (British, American & Australian) also out of a clear (blue) sky (American & Australian)

if something happens out of the blue, it happens suddenly and you are not expecting it Then one day, completely out of the blue, I had a letter from her. The invasion came out of a clear blue sky and caught everyone off guard.

See also: blue, of, out

out of the blue

1. From an unexpected or unforeseen source: criticism that came out of the blue.

2. At a completely unexpected time: a long-unseen friend who appeared out of the blue.

See also: blue, of, out