Usually means: Falling asleep very quickly, deeply.
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We found 6 dictionaries that define the word out like a light:

General (4 matching dictionaries)
  1. out like a light: Merriam-Webster
  2. out like a light: Collins English Dictionary
  3. out like a light: Wiktionary
  4. Out Like a Light: Wikipedia, the Free Encyclopedia

Miscellaneous (1 matching dictionary)
  1. out like a light: Idioms

Slang (1 matching dictionary)
  1. out like a light: Urban Dictionary

Definitions from Wiktionary (out like a light)

adjective:  (simile, colloquial) Asleep or unconscious, particularly if this has occurred suddenly and the sleep is deep.

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