on the verge of breaking out, on the brink of eruption
一触即发
A situation that could explode at any moment
— 双重赔偿 (1944)
他上了我的妞,可是他一触即发!
He slept with my girl, but he blows up at the slightest touch!
— 你妈妈也一样 (2001)
局势一触即发
The situation is on the brink of breaking out.
— 一代宗师 (2013)