conk out

verb3

1. •
   (informal) To stop functioning.

   • The old car conked out halfway up the hill.
2. •
   (informal) To die.

   • He lived to be 90, then conked out in his sleep.
3. •
   (informal) To fall fast asleep; to sleep soundly.

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