lights-out

noun

1
: a command or signal for putting out lights
2
: a prescribed bedtime for persons living under discipline

Examples of lights-out in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The Tigers have been lights-out defensively just about every week. Tyler Everett, MSNBC Newsweek, 18 Oct. 2025 Matt Schubert, sports editor: San Diego State 15, CSU 10 The Aztecs are back to playing lights-out defense and winning ugly — Rocky Long style. Kyle Newman, Denver Post, 2 Oct. 2025 The sketch wasn’t lights-out amazing, but the switcheroo was interesting. Nicholas Quah, Vulture, 15 Sep. 2025 These lights-out facilities are powered by self-learning systems that adapt production in real time, manage quality control via computer vision and conduct predictive maintenance without supervision. Senthil M Kumar, Forbes.com, 3 Sep. 2025 See All Example Sentences for lights-out

Word History

First Known Use

1864, in the meaning defined at sense 1

Time Traveler
The first known use of lights-out was in 1864

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Cite this Entry

“Lights-out.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lights-out. Accessed 24 Oct. 2025.

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