1
general::
conk out
informal
2. to go to sleep very quickly, or to suddenly become unconscious
• After a six-hour flight and a long day of meetings, it's not surprising you conked out., conk out
informal
1. If vehicles and other machines conk out, they stop working or fail suddenly
• I was just two miles from home when my motorbike conked out!
Cambridge-Phrasal Verbs