boil over

柯林斯词典

1. PHRASAL VERB When a liquid that is being heated boils over, it rises and flows over the edge of the container. 煮沸而溢出
Heat the liquid in a large, wide container rather than a high narrow one, or it can boil over. 液体加热时要放进宽大的容器里，不要放进细长的容器里，否则它会溢出来。
2. PHRASAL VERB When someone's feelings boil over, they lose their temper or become violent. (情绪) 失去控制
Sometimes frustration and anger can boil over into direct and violent action. 有时无奈和愤怒会失去控制，变成直接的暴力行为。