out of the blue

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English

Etymology

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

Pronunciation

  • IPA(key): /aʊt ɒv ðə bluː/
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Prepositional phrase

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.

Translations

See also