by surprise

US 
UK 
  • adv.突然
  • Web冷不防;猛不防;出其不意
adv.
1.
突然
un.
1.
十分意外

Sample Sentence

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