Definition of “break out” - English Dictionary

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“break out” in British English

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break out

phrasal verb with break uk /breɪk/ us /breɪk/ verb broke, broken

(START)

B2 If something dangerous or unpleasant breaks out, it suddenly starts:

War broke out in 1914.
Fighting has broken out all over the city.
break out in a rash, sweat, etc.

to suddenly have red marks or sweat appear on your skin:

She broke out in a rash after eating some strawberries.
It didn't take much exercise to make him break out in (a) sweat.
When I heard the noise I broke out in a cold sweat.

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(Definition of “break out” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“break out” in American English

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break out

phrasal verb with break us /breɪk/ verb

(ESCAPE)

to escape from a place or a situation:

Two inmates broke out of prison and are still at large.

break out

phrasal verb with break us /breɪk/ verb

(SKIN CONDITION)

to suddenly begin to have a rash (= spots on the skin):

Detergents make my hands break out.
I hate it when I break out in hives.

(Definition of “break out” from the Cambridge Academic Content Dictionary © Cambridge University Press)