American Idioms – Idiom Wizard Lists Over 5,500 Idioms & Slang Descriptions

Out of the blue


Suddenly. Unexpected occurrence. ‘Blue’ refers to the wide, blue sky, so when something occurs or appears suddenly it seems to have just come from the sky. (Compare to Out of thin air, Poof or Throw a curveball.)

“We were having a nice conversation when ou of the blue, she started yelling at me and walked away for no reason.”

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