lights-out

noun

1. a prescribed bedtime

• Hypernyms: ↑bedtime

• Part Holonyms: ↑night, ↑nighttime, ↑dark

2. (military) signal to turn the lights out

• Syn: ↑taps

• Topics: ↑military, ↑armed forces, ↑armed services, ↑military machine, ↑war machine

• Hypernyms: ↑bugle call

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\\ˈ ̷ ̷ˈ ̷ ̷\ noun (plural lights-out)

1. : a command or signal (as a bell or bugle call) for putting out lights

2. : a prescribed bedtime for persons living under discipline (as in a boarding school or army camp)

the only place where he could hide to study after lights-out — H.H.Martin

while away the hours before lights-out — English Digest

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lights-out UK US noun [uncountable]

the time at night when people in a school, camp, prison or other institution must turn off the lights and go to sleep

Thesaurus: school or university day_hyponym relating to prison life_hyponym degrees and other academic qualifications_hyponym

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lights-out «LYTS OWT», noun.

a signal at which lights must be put out.

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/ˈlaıtsˈaʊt/ noun [noncount]

: a time when people (such as soldiers, prisoners, or students) are required to turn out the lights and go to bed

Lights-out is at 10 p.m.

They have to be back before lights-out.