What does BLUE mean? "out of the blue＂In this case,what does BLUE mean?

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What does BLUE mean? "out of the blue＂

In this case,what does BLUE mean?

2018年11月6日 06:57

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.

2018年11月6日

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2018年11月6日

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