out like a light

adjective

Asleep or unconscious, particularly if this has occurred suddenly and the sleep is deep.

“Once she received anesthesia, she was out like a light.”

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Meanings

adjectiveout like a light (not comparable)
  1. colloquialnot comparablesimileAsleep or unconscious, particularly if this has occurred suddenly and the sleep is deep.

    Once she received anesthesia, she was out like a light.

Synonyms & antonyms

Also see
asleepsleepboundzonked
Cite this entry
APA

out like a light. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/out%20like%20a%20light

MLA

“out like a light.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/out%20like%20a%20light. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “out like a light,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/out%20like%20a%20light.

Source: out like a light on Wiktionary, CC BY-SA 4.0.