out of the blue

Idioms  

1. see out of a clear blue sky.

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Example Sentences

But it isn’t a bolt out of the blue.

From Barron's

"I was devastated. It was completely out of the blue," he said.

From BBC

That offence was not out of the blue.

From BBC

"It started with a text out of the blue asking if I recognised a transaction - yes or no. Two and half hours later I was out of pocket by £1400."

From BBC

Wall Street may be the only place in America where strangers will come up to you out of the blue and try to hand you free money.

From MarketWatch