out of the blue

English

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out of the blue

  • /aʊt əv ðə ˈbluː/

Where it comes from

Short for out of the blue sky, likening an unexpected event to lightning or rain coming suddenly from a cloudless sky.

phrase

  1. idiomatic Unexpectedly; without warning or preparation. After I hadn’t heard from her in six months, she called me out of the blue to meet for lunch.

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MLA

"out of the blue." Wiktionary, via Micwyn, micwyn.com/word/out%20of%20the%20blue. Accessed 6 Nov. 2026.

APA

out of the blue. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/out%20of%20the%20blue

Chicago

"out of the blue." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/out%20of%20the%20blue.

BibTeX
@misc{out_of_the_blue_2026,
  title = {out of the blue},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/out%20of%20the%20blue},
  urldate = {2026-11-06}
}