|Origin:||CONK2; conk out 1900-2000 Origin unknown|
to hit someone hard, especially on the head
conk outphrasal verb
if a machine or car conks out, it suddenly stops working:
Our car conked out on the way home.
if someone conks out, they fall asleep because they are very tired:
I got home from work and I just conked out on the sofa.