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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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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exaggeratedly or childishly emotional

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