lights–out

play
noun \ˈlīts-ˈau̇t\

Definition of lights–out

  1. 1 :  a command or signal for putting out lights

  2. 2 :  a prescribed bedtime for persons living under discipline

First Known Use of lights–out

1868


LIGHTS–OUT Defined for English Language Learners

lights-out

play
noun

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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