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Discover LudwigThe phrase "lights out" is correct and usable in written English.
It is usually used to indicate that it is time to turn off the lights and go to bed. For example, you could say, "It's lights out at nine o'clock tonight."
Dictionary
lights out
verb
Third person singular of light out
Exact(50)
He played lights out".
Lights out, I guess.
She also defends lights out".
"And Greg played lights out".
"Their bullpen's been lights out".
"He is playing lights out".
Similar(10)
"It was still light out".
"White light in, white light out".
They landed and lit out again, restless.
A stranger screamed: "Put that light out".
Thee light out here is amazing.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com