out of the blue

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English[edit]

Etymology[edit]

Short for out of the clear blue sky, likening a sudden and unexpected event to something unexpectedly falling out of the sky.

Pronunciation[edit]

  • IPA(key): /aʊt ɒv ðə bluː/

Adverb[edit]

out of the blue

  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.
    I really can't understand how something like this could simply pop up out of the blue.

See also[edit]

Translations[edit]