好自为之,意思是自己妥善处置,自己看着办,大部分时候用于劝诫、警告别人。可以翻译为look out for oneself,behave yourself。也可以用Its your funeral表示,指you think someone is wrong by insisting on doing something in a particular way, but that they will be affected1 by the bad consequences resulting from it, and you will not。
例句:
从目前起,请你好自为之。
From now on, please behave yourself.
我帮不了你什么忙,你好自为之吧。
I cant help you much. Look out for yourself.
随意你吧,你会后悔的,好自为之。
Have it your own way. Youll be sorry. Its your funeral.