teeter
verb [ I usually + adv/prep ] uk/ˈtiː.tər/ us/ˈtiː.t̬ɚ/
摇晃，摇摇欲坠;蹒跚行走
to appear to be about to fall while moving or standing
Danielle was teetering around in five-inch heels. 丹妮尔穿着5英寸高的高跟鞋摇摇晃晃地走来走去。
Idiom
teeter on the brink/edge of somethingidiom 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。