lights-out

noun
\ ˈlīts-ˈau̇t How to pronounce lights-out (audio) \

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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The first known use of lights-out was in 1868

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More Definitions for lights-out

lights-out

noun

English Language Learners Definition of lights-out

: 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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