out of the blue Meaning in the Cambridge English Dictionary
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Meaning of “out of the blue” in the English Dictionary

"out of the blue" in British English

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out of the blue

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

"out of the blue" in American English

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out of the blue

unexpectedly: My ​oldroommate called me out of the ​blue.
(Definition of out of the blue from the Cambridge Academic Content Dictionary © Cambridge University Press)
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