攻其不备 (攻其不備) gōng qí bù bèi
          
              gōng qí bù bèi 
              
              set phrase 
              attack [the enemy] when he is not prepared 
              Domain: Idiom 成语
              
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                Notes: (CC-CEDICT '攻其不備'; Guoyu '攻其不備')