English Reference

Word

blackout

Phoneticsblack·out, stress on the first syllable

US/ˈbɫæˌkaʊt/

UK/blˈækaʊt/

Definitions

01power failure

B2 · Upper Intermediate Countable noun

n. a period of time when there is no electricity in a building or area.

n. a large-scale failure of electrical power supply to a specific geographic area.

“The storm caused a massive blackout that left the whole city in the dark.”

“The aging infrastructure was unable to handle the peak demand, resulting in a rolling blackout that affected several industrial districts.”

Synonyms

power cutoutage

02loss of consciousness

B2 · Upper Intermediate Countable noun Medicine

n. a short period when you are unconscious or cannot remember what happened.

n. a temporary loss of consciousness or memory, often induced by medical conditions or substance use.

“He had a total blackout and couldn't remember how he got home.”

“The patient reported experiencing a brief blackout during the flight, prompting the medical team to investigate potential neurological causes.”

Synonyms

faintswoonmemory loss

03censorship

C1 · Advanced Countable noun Formal

n. when the government or an organization stops news or information from being shared.

n. the official suppression or withholding of information, particularly by a government during a crisis.

“The government imposed a media blackout during the military operation.”

“Despite the official news blackout, reports of the protest began to leak out through encrypted messaging apps.”

04blocking light

B2 · Upper Intermediate Countable noun

n. making a room or area completely dark by covering windows.

n. the act of extinguishing or hiding all lights, historically as a defense against air raids.

“We put up blackout curtains so the streetlights wouldn't keep us awake.”

“During the war, strict blackout regulations were enforced to ensure that no light was visible to enemy aircraft from the ground.”

Synonyms

05internet protest

C1 · Advanced Countable noun Computing Informal

n. when a website is intentionally taken offline to protest against something.

n. an intentional, temporary outage of a website or digital service, typically executed as a form of political or social protest.

“Several major websites joined the blackout to protest the new internet laws.”

“The digital blackout served as a powerful demonstration of the community's collective influence over the platform's advertising revenue.”

Synonyms

Real-World Examples

“The next complete lunar blackout won't be until New Year's Eve 2028, with Asia and Australia at center stage.”
Phys.org 22 Aug 2026
“No amount of darkness, earplugs or blackout blinds can entirely silence it.”
BBC News 19 Jul 2026

Etymology

Deverbal from black out.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Domain

Internet

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
Frequency
Frequent
Level
B2 · Upper Intermediate
Updated

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English Reference