conks out

Verb

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

1. (informal, intransitive) To fall fast asleep; to sleep soundly.
   • He wasn't there, just the dog, conked out on the porch.

   Synonyms:

   zonk out

2. (informal, intransitive) To stop functioning.
   • The old car conked out halfway up the hill.
3. (informal, intransitive) To die.
   • He lived to be 90, then conked out in his sleep.