"take matters into your own hands" in Chinese (Simplified)
Definition
自己着手处理问题，而不是等待别人采取行动或帮助。
Usage Notes (Chinese (Simplified))
通常指别人没有作为时，自己主动采取措施解决重要问题。不是字面意思，不用于小事。常与“决定”、“不得不”等词搭配。
Examples
If nobody helps, I will take matters into my own hands.
如果没有人帮忙，我会**亲自采取行动**。
She had to take matters into her own hands to fix the problem at work.
她不得不**亲自采取行动**来解决工作中的问题。
Sometimes, you need to take matters into your own hands to get things done.
有时候，你得**亲自采取行动**才能把事情做好。
After waiting for weeks, he finally decided to take matters into his own hands and called the boss directly.
等了几个星期后，他终于决定**亲自采取行动**，直接给老板打电话。
You can complain all you want, but sometimes you just have to take matters into your own hands.
你可以一直抱怨，但有时候你只能**亲自采取行动**。
When the repairman never showed up, we had no choice but to take matters into our own hands and fix the sink ourselves.
修理工一直没来，我们只好**亲自采取行动**，自己修好了水槽。