WordWeb Online

1. Stop operating or functioning
   "The engine conked out on the way to town";
   - fail, go bad, give way, die, give out, go, break, break down, pack up [Brit, informal]
    
2. Use up all one's strength and energy and stop working
   "At the end of the march, I conked out";
   - poop out [N. Amer, informal], peter out, run down, run out

Derived forms: conking out, conked out, conks out

Type of: change, fatigue, jade, pall, tire, weary