to be very close to a very unpleasant or dangerous situation :
The country is teetering on the brink of civil war.
to be very close to a very unpleasant or dangerous situation :
The country is teetering on the brink of civil war.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005