out of the blue

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English

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Etymology

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

Pronunciation

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Prepositional phrase

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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

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See also

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