See more synonyms for lights out on Thesaurus.com- Chiefly Military. a signal, usually by drum or bugle, that all or certain camp or barracks lights are to be extinguished for the night.
- bedtime.
Origin of lights out
First recorded in 1865–70
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for lights out- the time when those resident at an institution, such as soldiers in barracks or children at a boarding school, are expected to retire to bed
- a fanfare or other signal indicating or signifying this
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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