处在(灾难或危险)的边缘;濒临
teeter on the brink / edge of sth
to be very close to a very unpleasant or dangerous situation
The country is teetering on the brink of civil war.这个国家正处在内战的边缘。
释义来自《牛津高阶英汉双解词典》第 9 版