Blackout

BLACKOUT noun

[ C ] uk/ˈblækaʊt/ us blackout noun [C]
(NO INFORMATION)

a situation in which people are not allowed to be told about something

утаивание информации
[ usually singular ] a media/news blackout blackout noun [C]
(NO LIGHTS)

a period during a war when no lights must show at night

светомаскировка