Out of the blue meaning in English

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Definition

(to call someone) out of the blue: (to call someone) unexpectedly, without warning idiom
  • "knock on your door out of the blue saying that they notice that your roof / driveway / windows / walls need urgent work."
  • "I apologize for calling like this, out of the blue."
  • "to come out of the blue/out of a clear blue sky (this is my favourite today: sky AND blue!) - to come unexpectedly, as a total surprise"

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