为虺弗摧，为蛇若何[wéi huǐ fú cuī wéi shé ruò hé]
词典eliminate the enemy when he is still weak：为虺弗摧，为蛇若何；为虺弗摧， 为蛇若何。
词典get rid of the evildoer as soon as possible [the sooner the better, before it is too late]