Definition
This idiom is used to convey that someone must accept the consequences of their actions, especially when those consequences are negative or undesirable.
自作自受
You decided not to study, and now you've failed the exam; you've made your bed, now lie in it.
你決定不讀書，現在考試不及格；你自作自受。
They chose to take shortcuts, and now they're facing legal troubles; they've made their bed, now lie in it.
他們選擇走捷徑，現在面臨法律問題；他們自作自受。
She knew the risks but did it anyway; now she has to take responsibility for all of it, she has made her bed, now lie in it.
她知道風險但還是做了；現在她必須為這一切負責，她自作自受。