Lights Out Definition

noun
A signal, as in a military camp, etc., to extinguish lights at bedtime.
Webster's New World
Bedtime.
Webster's New World
Of or giving an overmastering performance.
Their pitcher was lights out in the final innings.
Webster's New World

Alternative form of lights-out.

Wiktionary

The prescribed bedtime for persons living in a boarding school or staying in a hospital.

We were all expected to be in bed by lights-out.
Wiktionary
Synonyms:
verb
Third-person singular simple present indicative form of light out.
Wiktionary

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