Out of the Blue
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Out of the Blue

Means: Without warning, surprisingly

Example of use: That storm came out of the blue, so no one had an umbrella.


Interesting fact

The idiom “out of the blue” is actually derived from an older idiom: “Dropping out of the clear blue sky.” This saying has to do with lightning. Because its voltage is so great, lightning can sometimes precede a thunderstorm, surprising people when it strikes while the sky is still clear and blue.