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boil up

B1 neutral separable both
In simple words

To make a liquid very hot until it bubbles strongly, or for a feeling to start growing quickly and strongly inside you.

Literal meaning: To cause something to boil up (rise) due to heat.

Meanings

1 A2 neutral

To heat a liquid until it reaches boiling point and bubbles vigorously.

"He boiled up a large pot of water for the pasta."

Grammar: separable
2 B1 idiomatic neutral

(Of an emotion or situation) To intensify rapidly, suggesting an imminent outburst.

"She could feel the anger boiling up inside her as she listened to his excuses."

Grammar: inseparable
3 B2 idiomatic neutral

(Of trouble or conflict) To develop and grow more intense, suggesting things are about to get worse.

"There's trouble boiling up along the border — the situation could escalate at any moment."

Grammar: inseparable
Usage notes

The literal sense is common in everyday cooking contexts. The figurative sense describes strong emotions (anger, resentment) rising inside a person — often suggesting they are about to explode. 'Something is boiling up inside me' is a common pattern.

Commonly used with

water kettle anger resentment fury trouble

Forms

Base
boil up
I/you/we/they
3rd person
boils up
he/she/it
Past simple
boiled up
yesterday
Past participle
boiled up
have + pp
-ing form
boiling up
continuous

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Synonyms

bring to a boil heat up simmer up intensify rise build up

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