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Definition of blackout noun from the Oxford Advanced Learner's Dictionary

blackout

noun
 
/ˈblækaʊt/
 
/ˈblækaʊt/
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  1. a period when there is no light as a result of an electrical power failure
    • The storm caused blackouts in many areas.
    compare brownoutTopics The environmentc2
  2. a situation when the government or the police will not allow any news or information on a particular subject to be given to the public
    • a news/media blackout
    • The government imposed a news blackout during the crisis.
  3. [usually singular] a period of time during a war when all lights must be put out or covered at night, so that they cannot be seen by an enemy attacking by air
    • It used to take hours to travel home in the blackout.
    • They met during a blackout in the war.
    Topics War and conflictc2
  4. [usually plural] (British English) a piece of material that covers windows to stop light being seen from outside, or light from outside from coming into a roomTopics Houses and homesc2
  5. a temporary loss of consciousness, sight or memory
    • She had a blackout and couldn't remember anything about the accident.
See blackout in the Oxford Advanced American Dictionary
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noun
 
 
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