- Home
- Idioms
- out of the blue
out of the blue
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 airout 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.
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.