conk out

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See also: conkout


Alternative forms[edit]


Possibly an onomatopoeic imitation of the sound of a stalling internal combustion engine. Possibly coined by British motorcyclists circa 1910.


conk out (third-person singular simple present conks out, present participle conking out, simple past and past participle conked out)

  1. (intransitive, informal) To fall fast asleep; to sleep soundly.
    Synonym: zonk out
    He wasn't there, just the dog, conked out on the porch.
  2. (intransitive, informal) To stop functioning.
    The old car conked out halfway up the hill.
    • 2016, Joseph Henrich, chapter 5, in The Secret of Our Success [] , Princeton: Princeton University Press, →ISBN:
      So, if you want to race your dog, plan a 25-kilometer race on a hot summer day. He'll conk out.
  3. (intransitive, informal) To die.
    He lived to be 90, then conked out in his sleep.