Conk out

verb, slang

Definitions

Verb
  1. 1
    To fall fast asleep; to sleep soundly. informal, intransitive

    "He wasn't there, just the dog, conked out on the porch."

  2. 2
    use up all one's strength and energy and stop working wordnet
  3. 3
    To stop functioning. informal, intransitive

    "The old car conked out halfway up the hill."

  4. 4
    stop operating or functioning wordnet
  5. 5
    To die. informal, intransitive

    "He lived to be 90, then conked out in his sleep."

Etymology

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

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