brink
/ˈbriŋk/
noun
edge; especially : the edge at the top of a steep place
a bank especially of a river
the point of onset : verge
noun
the edge at the top of a steep cliff —usually used figuratively to refer to a point that is very close to the occurrence of something very bad or (less commonly) very good
idiom
close to being in a specified state or condition
The countries are teetering on the brink of war.