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

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"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 completely unexpected:

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 old roommate 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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