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Lights-out is the time at night, in a school dormitory, the army, a camp, a prison, or a similar group, when everyone must put the lights out and go to sleep. It is a rule on the clock, not a note that the room is already dark. A teacher or sergeant may just shout “Lights out!” Families at home more often say bedtime. People stretch it in sport and stories: “lights out” can mean the other side is finished, as if someone switched them off — though actually the core meaning is still that official hour when the lamps must go off.
熄燈時間
組成lights (the lamps) + out (switched off). The moment when the lights must go out.
原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
lights-outnoun/ˈlaɪts.aʊt/
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The time at night at which artificial lights are to be turned off, a curfew or bedtime.
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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.
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Something hopeless, over; unconsciousness.
- It's gonna be lights out for you, pal!
- Hardy landed a picture perfect right uppercut square on Padilla's jaw. It was lights out for the formerly undefeated pugilist.
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hobbieslifestylesportsA decisive play.
- No one could really stop him in the second half and he was lights-out in OHL playoffs.
lights-outadj/ˈlaɪts.aʊt/
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businessmanufacturingDone or performed in the dark because of a fully automated working environment. Often describes night shift or third shift work.
- lights-out manufacturing
- lights-out production
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。