Meaning of “boil over” in the English Dictionary

"boil over" in American English

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boil over

phrasal verb with boil us /bɔɪl/ verb [ I/T ]

(of a liquid) to rise up in a cooking container and flow over the edge

If anger or other feelings boil over, they become too strong to be controlled:

(Definition of “boil over” from the Cambridge Academic Content Dictionary © Cambridge University Press)