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What does BLUE mean? "out of the blue"

In this case,what does BLUE mean?

Nov 6, 2018 6:57 AM
Answers · 4
2
The phrase comes from blue sky. It would be surprising to see rain come out of a blue sky, hence something that comes 'out of the blue' is a surprise.
November 6, 2018
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November 6, 2018
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