out of the blue

US 
UK 
  • un.难得到的;突然;突如其来;出人意料
  • Web出乎意料;突然地;一日狂徒
un.
1.
难得到的
2.
突然,冷不防;突如其来;出人意料;出其不意地

Sample Sentence

Definition:
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard