Out of the blue

Explanation: What is an idiom?

Suddenly, without any warning.


"Hey George, get me a drink mate."

"Yeah alright, what's up?"

"Wendy wants a baby."

"What, now?"

"No, you idiot. I came home from work, and there she was. Says she'd been thinking about something important all week, and she's decided that it's time we started a family."

"Crickey mate. Were you expecting her to say anything like that?"

"No. Completely out of the blue, it was."

"Poor sod. Here, get this down you..."


A much rarer version of this idiom is out of the bright blue sky, and it is the sky to which this idiom refers. If you look up into the sky on a clear cloudless day, it is very easy to identify anything. It's very surprising for anything to come to you out of a bright blue sky without you noticing it, and it is this element of surprise which is an essential part of the meaning of this idiom.

Category: o,colours

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