outbreak
Americannoun
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a sudden breaking out or occurrence, especially of something bad or unpleasant; eruption.
the outbreak of war.
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a sudden and active manifestation.
an outbreak of hives.
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a sudden increase in the incidence of a disease or medical condition in a particular place or population: a worldwide polio outbreak in the early 1900s.
a serious outbreak of malaria in northern Uganda;
a worldwide polio outbreak in the early 1900s.
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an outburst.
an outbreak of temper.
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an insurrection, revolt, or mutiny.
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a public disturbance; riot.
noun
Other Word Forms
Noun Inflected Forms
Etymology
Origin of outbreak
Explanation
A sudden or abrupt onset of something really bad is an outbreak. You could experience an outbreak of measles or an outbreak of violence; either way, try to protect yourself. When you talk about an outbreak of something, it's almost always something terrible, or at least unwanted. You might hear about an outbreak of war in a distant country, or an outbreak of violence in a big city, or an outbreak of disease among farm animals. Outbreak started as a Middle English verb around 1300, becoming a noun meaning "eruption" about three hundred years later.
Vocabulary lists containing outbreak
The Boy in the Striped Pajamas
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Talk Like Shakespeare Day, List 6
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“Vaccine Controversy Shows Why We Need Markets, Not Mandates” by Ron Paul
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
More than 100 passengers were sickened in a recent norovirus outbreak on the Ruby Princess cruise ship that departed from California last month and arrived back at port Thursday.
From Los Angeles Times • Jul. 2, 2026
If confirmed it would be the first case in the UK since an outbreak in the Democratic Republic of Congo and Uganda in May.
From BBC • Jun. 30, 2026
Versova, which has had about 25 million egg-laying hens die from the bird flu outbreak, also said it denies wrongdoing and reached the settlement to focus on its business.
From The Wall Street Journal • Jun. 30, 2026
Even worse, the screwworm outbreak has started to spread to the U.S., with 15 confirmed cases.
From MarketWatch • Jun. 30, 2026
But it seems possible that in the years preceding the outbreak of Marburg virus in Germany, a hidden outbreak of the virus occurred on the slopes of Mount Elgon.
From "The Hot Zone" by Richard Preston
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
