To break out is to escape from prison — and also what wars and fires suddenly do. Two senses about something getting loose.
The escape sense gives the noun a breakout, which is what films are made about. The sudden-start sense covers war, fire, fighting and disease, so an outbreak is the noun there. There are two smaller uses: breaking out in a rash or a sweat is involuntary, and breaking out of a routine means escaping something confining. Breaking out the good glasses means fetching them for an occasion.
Practised in Phrasal Verbs, A Man Called Ove
First appears in chapter 20 of A Man Called Ove.
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