lights-out

lights out

noun
1.
Chiefly Military. a signal, usually by drum or bugle, that all or certain camp or barracks lights are to be extinguished for the night.

Origin:
1865–70

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
lights out
 
n
1.  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
2.  a fanfare or other signal indicating or signifying this

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