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

The outbreak has shown signs of slowing since, but experts caution that the recovery may be patchwork. — Lauren J. Young, Scientific American, 18 Sep. 2026

Get to the creepy hospital’s 48th floor, where a laboratory may be able to fashion a cure for this viral outbreak turning people into the walking, running, jumping, chomping dead. — David Fear, Rolling Stone, 18 Sep. 2026

As a result, the rise in diesel costs threatens to worsen a surge of inflation set off by the outbreak of the Iran war nearly seven months ago. — ABC News, 18 Sep. 2026

Based on the popular Capcom video games, Resident Evil stars Austin Abrams as Bryan, an outmatched medical courier who becomes trapped in a monster outbreak in Raccoon City during a single night of chaos and has to try to survive. — Lexi Carson, HollywoodReporter, 18 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