boil over

verb

boiled over; boiling over; boils over
Synonyms of boil overnext

intransitive verb

1
: to overflow while boiling
2
a
: to become violent or lose control because of anger
so frustrated he's ready to boil over
b
: to develop into something more violent
Their disagreement finally boiled over into a fight.
boilover noun

Examples of boil over in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
But frustration boiled over Sunday. Alex Zietlow, Charlotte Observer, 15 Feb. 2026 In Thursday’s episode of The Pitt, the long-simmering tensions over the use of AI at the Pittsburgh Trauma Medical Center boiled over. Andrew R. Chow, Time, 13 Feb. 2026 Bring to a boil over medium-high and cook, stirring occasionally, 9 minutes. Martha Stewart, 11 Feb. 2026 Outrage boiled over when those commissioners unanimously passed a resolution to support Immigration and Customs Enforcement (ICE) and the federal government's immigration enforcement actions. Mike Hellgren, CBS News, 11 Feb. 2026 See All Example Sentences for boil over

Word History

First Known Use

15th century, in the meaning defined at sense 1

Time Traveler
The first known use of boil over was in the 15th century

Browse Nearby Words

Cite this Entry

“Boil over.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/boil%20over. Accessed 16 Feb. 2026.

Kids Definition

boil over

verb
1
: to overflow while boiling
2
: to become so angry as to lose one's temper

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