teeter on the brink/edge of something idiom
濒临，处于（糟糕形势）的边缘
If something is teetering on the brink/edge of a bad situation, it is likely that the situation will happen soon.
What we are seeing now is a country teetering on the brink of civil war. 我们现在所看到的是一个濒临内战的国家。