Definition of go out like a light in English:

go out like a light

phrase

informal
  • Fall asleep or lose consciousness suddenly.

    • ‘she returned to bed and went out like a light’
    • ‘Staggering, I turned around to face my attacker but never saw him, a second fist followed the first and I went out like a light.’
    • ‘I can hear her breathing and going out like a light.’
    • ‘Something hit the back of the trench and I went out like a light.’
    • ‘I hit this kid and he struck his head and went out like a light.’
    • ‘He looked dazed for a minute and then went out like a light.’
    • ‘He went out like a light a few minutes later, and Mia tiptoed out of the room.’
    • ‘But last night, after everything was all packed up, and my bed frame dismantled, I just went out like a light.’
    • ‘I don't know if the rodent returned as I was so tired by this stage that I went out like a light.’
    • ‘Maybe tomorrow, were her last thoughts before she went out like a light.’
    • ‘Every time a film clip came on - no matter how interesting or bizarre - I went out like a light, but she was too polite to comment.’