flash-point
n
1 temperature at which the vapour above a liquid such as oil gives a brief flash, but does not catch fire, when a flame is brought near it 閃點; 燃點; 引火點.
2 (fig 比喻) point at which violence or anger breaks out (暴力事件或憤怒的)爆發點
Community unrest is rapidly approaching the flashpoint. 群眾的不安定情緒已接近一觸即發之勢.