outbreak

noun

out·​break ˈau̇t-ˌbrāk 

1

a

: a sudden or violent increase in activity or currency

the outbreak of war

b

: a sudden rise in the incidence of a disease

an outbreak of measles

c

: a sudden increase in numbers of a harmful organism and especially an insect within a particular area

an outbreak of locusts

2

: insurrection, revolt

Synonyms of outbreak

• flurry
• burst
• outburst

Examples of outbreak in a Sentence

there was an immediate outbreak of paper shuffling and a pretense of work when the supervisor passed through the room

the government quelled the outbreak with ruthless efficiency

Recent Examples on the Web

In that time, Gundlach Bundschu has survived a major pest outbreak, the San Francisco earthquake and fire, which destroyed one million gallons of wine and Prohibition. — Los Angeles Times, 25 Sep. 2026

Three Florida counties have declared states of emergency as a growing outbreak of dengue has infected hundreds across the state this year. — Alex Deluca, Washington Post, 25 Sep. 2026

Following the outbreak of Middle East conflicts, the two paths diverged sharply, with the gap widening further as summer arrived. — CNBC, 25 Sep. 2026

Kasirye and her team led Sacramento County through measles outbreaks, spikes in opioid addictions and the COVID-19 pandemic. — Veronica Fernandez-Alvarado, Sacbee.com, 24 Sep. 2026

Word History

First Known Use

1562, in the meaning defined at sense 1a

Rhymes for outbreak

• awake
• backache
• beefsteak
• betake
• cheesecake
• cupcake
• daybreak
• earthquake
• forsake
• gouache
• handshake
• headache

Kids Definition

outbreak

noun

out·​break ˈau̇t-ˌbrāk 

1

: a sudden increase in activity, use, or acceptance

the outbreak of war

2

: something (as an epidemic or revolution) that breaks out

an outbreak of measles

Medical Definition

outbreak

noun

out·​break ˈau̇t-ˌbrāk 

1

: a sudden rise in the incidence of a disease

an outbreak of measles

2

: a sudden increase in numbers of a harmful organism and especially an insect within a particular area

an outbreak of locusts