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English definition of “lights-out”

lights-out

noun [U]     /ˌlaɪtsˈaʊt/
(at a school where children live or in the army) the time in the evening when the lights are switched off in the room where people sleep: No talking after lights-out!Sleep and sleepingDays and times of day
(Definition of lights-out noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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