Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: CONK2; conk out 1900-2000 Origin unknown

conk

2 verb
     
conk2 [transitive]
informal to hit someone hard, especially on the head

conk out

phrasal verb
1 if a machine or car conks out, it suddenly stops working:
Our car conked out on the way home.
2 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.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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