lights-out

US /ˈlaɪts.aʊt/
UK /ˈlaɪts.aʊt/
"lights-out" picture
1.

the time when lights are to be extinguished, especially in a military camp or dormitory

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At lights-out, all soldiers must be in their bunks.
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The warden announced lights-out at 10 PM.
2.

a knockout in boxing or other combat sports

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The boxer delivered a powerful punch, resulting in a lights-out victory.
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One more hit and it's lights-out for him.
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knockoutKOTKOstoppage
1.

causing a knockout or rendering someone unconscious

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He delivered a lights-out punch to his opponent.
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The drug had a lights-out effect, putting him to sleep instantly.
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knockoutstunningsedativehypnotic
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lightlightinglightnessin the light ofgo out like a lightout-and-outtraffic light