# boil over

CEFR B2 · Phrasal verb

Source: https://englishreference.com/word/boil-over
Updated: 2026-10-22

## Definition

to reach a point where a situation or an emotion like anger becomes too strong to control. It can also mean liquid spilling out of a pot because it is too hot.

For teachers: to reach a state of intensity where a situation or emotion can no longer be contained, leading to an outburst. The verb is intransitive and often follows a period of 'simmering' tension.

## Examples

- The argument finally boiled over into a loud shouting match.
- Years of hidden resentment among the staff boiled over when the new office rules were announced.
- The long-standing diplomatic dispute boiled over into open conflict after the peace talks failed to reach a meaningful compromise.

## Pitfalls

- Not "The tension boiled over the meeting." but "The tension boiled over during the meeting." — The verb is intransitive and cannot take a direct object; it requires a preposition to link to a noun.

## Usage notes

- This phrase is almost always used for negative situations like anger, violence, or social unrest.
- Teaching tip: Explain the metaphor of a cooking pot to help students visualize how 'simmering' (quiet anger) leads to 'boiling over' (an outburst).

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.