lights-out /ˈlaɪts.aʊt/noun 5adjective 1 noun5 •The time at night at which artificial lights are to be turned off, a curfew or bedtime. •The prescribed bedtime for persons living in a boarding school or staying in a hospital.We were all expected to be in bed by lights-out. •Unconsciousness.There had been one almighty BANG and then it had been lights out. — 2007 •(euphemistic) Something hopeless, over; unconsciousness.It's gonna be lights out for you, pal! •A decisive play.No one could really stop him in the second half and he was lights-out in OHL playoffs. — 2017 adjective1 •Done or performed in the dark because of a fully automated working environment. Often describes night shift or third shift work.Their night shift is lights-out production. Their day shift handles tooling, setup, and staging to make sure that everything is ready for the next lights-out run.
