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English definition of “boil over”

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boil over

verb uk phrasal verb with boil   /bɔɪl/ us  

(PERSON)

If a difficult situation or negative emotion boils over, it cannot be controlled any more and people start to argue or fight.

(LIQUID)

If a liquid that is being heated boils over, it rises up and flows over the edge of the pan: Take the milk off the heat before it boils over. If a pan boils over, the liquid in it rises up and flows over the edge: That saucepan is boiling over.
(Definition of boil over from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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