1.
When a liquid that is being heated boils over , it rises and flows over the edge of the container.
Heat the liquid in a large, wide container rather than a high narrow one, or it can boil over.
PHRASAL VERB : V P
2.
When someone’s feelings boil over , they lose their temper or become violent.
Sometimes frustration and anger can boil over into direct and violent action.
= erupt
PHRASAL VERB : V P