Brink (noun)

1. The extreme edge or border of something, especially of a dangerous or disastrous situation.
2. The point just before a significant event or change occurs.

Origin:

From middle english brink, from old english brinc ("edge, brink, border, shore"), from proto-germanic *brinkiz ("edge, brink"), from proto-indo-european *bhreng- ("to project, extend").

Examples:

1. He was on the brink of losing his job.
2. The company was on the brink of bankruptcy.
3. She was on the brink of tears.
4. They were on the brink of war.
5. The country was on the brink of collapse.