lights-out

noun \ ˈlīts-ˈau̇t \

Definition of lights-out

1 : a command or signal for putting out lights
2 : a prescribed bedtime for persons living under discipline

First Known Use of lights-out

1868

in the meaning defined at sense 1

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LIGHTS-OUT Defined for English Language Learners

lights-out

Definition of lights-out for English Language Learners

  • : a time when people (such as soldiers, prisoners, or students) are required to turn out the lights and go to bed


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