brink
/brɪŋk/noun
1- an extreme edge of land before a steep or vertical slope（陡坡、峭壁的）边缘：
the brink of the cliffs.
悬崖的边缘。
1.1
- a margin or bank of a body of water水边：
at the brink of the pond I hesitated.
我踯躅在池塘边。
1.2
- the verge of a particular state, event, or action, typically one that is unwelcome or disastrous（尤指不好的或灾难性的状态、事件或行为的）始发点, 边缘：
the country was on the brink of a constitutional crisis.
该国处于宪法危机的边缘。
词源
Middle English: of Scandinavian origin.