“Out of the blue”: idiom meaning.

Out of the blue
If something happens “out of the blue” it happens unexpectedly, without warning. You didn’t know and didn’t think it was going to happen. You are surprised when something happens “out of the blue”.

Other examples of “out of the blue” idiom in a sentence

  • He told me this out of the blue!
  • The message came out of the blue.
  • Don’t just come here out of the blue! You scared me.

“Out of the blue”: use in context explanation

The girls are having fun pretending they are famous singers. They are singing in the bathroom and pretend they have lots of dedicated fans who are watching them. They dream of being famous. Suddenly, out of the blue, one of the girls notices there’s someone at the door, laughing at them. It’s her friend’s husband who thinks what they’re doing is funny and ridiculous. The girl is angry and says he can’t just come in out of the blue, without knocking on the door.