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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
And when the music finally began, the boys cut the lights out and proceeded to select dancing partners.
Once her backhand melted down, it was lights out down under.
And the way you have to do it is with all the lights out, and you can only use one eye and a small penlight.
Closing a business takes a little more than turning the lights out and locking the door.
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