lights-out

/หˆlaษชts.aสŠt/

IPA: /L AY1 T S AW0 T/

noun
  1. 1

    The time at night at which artificial lights are to be turned off, a curfew or bedtime.

  2. 2

    The prescribed bedtime for persons living in a boarding school or staying in a hospital.

    โ€œWe were all expected to be in bed by lights-out.โ€

Source: https://en.wiktionary.org/wiki/lights-out