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Definition

blackout noun (HIDE)

/ˈblæk.aʊt/ n [C]
a time when all lights must be hidden by law, or when there is no light or power because of an electricity failure
war-time blackouts
Power lines were blown down and we had a blackout of several hours.
the action taken to make certain that information about something is not reported to the public
a news blackout

(Definition of blackout noun (HIDE) from the Cambridge Advanced Learner's Dictionary)
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