lights-out

2 ENTRIES FOUND:

lights–out

noun \ˈlīts-ˈat\

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

Full 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

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