自生自灭

be left to fend for oneself, be left to live or die on one's own

verb Rare #28,952
be left to fend for oneself, be left to live or die on one's own Often implies being abandoned without help or care.
CH: 我不能让你自生自灭。
EN: I can't leave you to fend for yourself.

我准备自生自灭了

I’m just going to fend for myself and let things take their course.

— 触不可及 (2011)

让她自生自灭吧

Let her fend for herself.

— 塔巴德 (2018)