out of nowhere or unexpectedly
something which comes as a surprise.
genuine surprise or shock
happens suddenly and one is not expecting it
Out of the blue, a cat came in front of my bus.
His marriage proposal came out of the blue - but she said yes!
Junior running away from home was out of the blue.
The divorce news came out of the blue.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.