The phrasal verb "boil over" is predominantly used in informal contexts to describe a situation or emotions that have escalated beyond control, often resulting in an outburst. Commonly, it depicts the accumulation of negative feelings such as anger or frustration that reach a critical point and result in a visible or impactful release. It can also refer to literal situations where a liquid exceeds its boiling point and spills over a container. In formal discourse, "boil over" might be replaced with terms like "escalate" when describing conflicts or tensions. The frequency of its use is typically higher in spoken language and narrative writing, where emotional dynamics or tension are being vividly described.
B1
PreIntermediate
1. To become uncontrollable or to spill over, often used with emotions or situations that become too intense.
The anger in the room began to boil over when the topic of politics was brought up.
The tension between the two teams boiled over into a heated argument.
The protest started peacefully, but it boiled over into violence by nightfall.
2. For a liquid, to rise over the edge of the container during boiling.
Make sure to stir the soup regularly, or it might boil over.
The pot boiled over because I forgot to turn down the heat.
If the milk boils over, it can make a huge mess on the stove.