打落水狗 dǎ luòshuǐ gǒu
          
              dǎ luòshuǐ gǒu 
              
              set phrase 
              to beat a drowning dog; to pulverize an (already defeated) enemy; to hit somebody when he's down 
              Domain: Idiom 成语
              
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                Notes: (CC-CEDICT '打落水狗')