black·out 
/ˈblækˌaʊt/ noun
plural black·outs /ˈblækˌaʊt/ noun [count] 1 : a period when lights are kept off or are hidden from view to guard against enemy airplane attack in a war
▪ the blackouts of World War II 2 : a period when lights are off because of an electrical power failure
▪ She keeps flashlights and candles handy in case of a blackout. — compare brownout 3 : a sudden and temporary loss of consciousness, vision, or memory
▪ He told his doctor he had been experiencing blackouts. 4 : a situation in which some kinds of information are deliberately kept from the public
▪ The government imposed a news blackout during the war.
▪ the blackouts of World War II
▪ She keeps flashlights and candles handy in case of a blackout. — compare brownout
▪ He told his doctor he had been experiencing blackouts.
▪ The government imposed a news blackout during the war.
— see also black out at 3black
