out of the blue definition, meaning - what is out of the blue in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “out of the blue”

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out of the blue

C1 If something happens out of the blue, it is completely unexpected: One day, out of the blue, she announced that she was leaving.
(Definition of out of the blue from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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