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to break out

to break out

196 3.8
To start suddenly, often with something dangerous like a fire or disease
  • phrasal verb
  • /breɪk aʊt/
: estallar
  • Two months after I arrived at the school, World War II broke out in Europe.
  • war broke out
  • fights broke out
  • revolution broke out

But yes, it sort of broke out during World War One.

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Examples

  • Street fighting broke out and the Emir soldiers fled.

  • A revolt has broken out in the East.

  • A war just broke out up on Earth.

  • A fight broke out almost every night.

  • By week's end, protests would break out across the UK.

  • We'd been there three months and war broke out and we had to leave.

  • For the first time, fighting broke out in an area near the capital San'a.

    Academic text (2012)
  • A fire broke out at a Samsung battery factory.

  • In 1969, the disease broke out in Afghanistan and began sweeping westward.

    Academic text (2013)
  • A major outbreak of the disease broke out in the region, prompting health officials to respond quickly.

Synonyms

to erupt
vsto break out
117 4.2

To suddenly start in a strong or violent way, often showing strong feeling

is sudden but less forceful and applies to unpleasant events
to flare
vsto break out
48 4.4

To become suddenly more intense, often about anger or violence

is the start of sudden unpleasant events rather than sudden emotional spikes
to break loose
vsto break out
39 3.8

Begin suddenly in a violent or noisy way

is about starting suddenly, not primarily about escaping control or becoming free
to flare up
vsto break out
37 4.7

To become suddenly stronger or worse, often for a short time

is the start of something new rather than increased intensity of existing issues
to burst out
vsto break out
23 3.4

Start suddenly and appear or happen quickly

is used for sudden starts that usually involve unpleasant incidents
to burst forth
vsto break out
7 5.4

Suddenly start to happen with a lot of energy

is used more for unpleasant sudden beginnings, not energetic emergence
to flame up
vsto break out
3 4.6

To suddenly start burning strongly or become much more intense

is broader, meaning sudden start of unpleasant events beyond burning

Antonyms

to calm down
  • Informal
989 1.4

To become less angry, excited, or upset

440 3.6

To stop or come to an end

How Sudden

to explode
591 2.8
to flare up
37 4.7
to break out
196 3.8
to erupt
117 4.2
to begin
∞ 1.0
to emerge
264 3.5

Surface Forms

break out infinitive
breaking out present participle
breaks out third person singular
broke out past
broken out past participle

Morphology

break + out

The components 'break' (separate/move away) and 'out' (toward the exterior) give a sense of moving or revealing something outward, which can be extended to presenting a product. However, the commercial sense of formally 'launching' or 'introducing' a product is a metaphorical extension rather than a direct compositional meaning, so a B1 learner who knows the words might not reliably infer this specific usage.

Etymology

Break out may come from seeing fire or trouble push through a wall or fence and come into view suddenly: the thing breaks free and comes out, so the phrase means 'to start suddenly', especially for bad events.