打落水狗

dǎ luòshuǐgǒu

[beat a drowning dog; (fig) completely crush a defeated enemy; beat the mad dog even through it is already in the water]∶已经落水的狗也必须坚决打击。 比喻要彻底打跨处于失败地位的凶恶敌人。 也指不能放过已失势的坏人。 "落水狗"。 比喻受到重大打击的凶恶的坏人或敌人