打ㄉㄚˇ落ㄌㄨㄛˋ水ㄕㄨㄟˇ狗ㄍㄡˇdǎluòshuǐgǒu

  1. 趁他人失敗或受挫、危難時再給予打擊。例 「他已經夠不幸了，就別再打落水狗」。

英lit. to beat a drowning dog (idiom)​, fig. to pulverize an (already defeated)​ enemy, to hit sb when he's down