Definitions

1. noun

the upper part of the human head, especially the upper part of the skull and the hair that grows from it

“She gently touched her conk, feeling the stubble grow in.”

2. verb

to strike or hit something or someone heavily, especially the head, causing unconsciousness or injury

“He conked the wall with a loud thud, leaving a dent.”

3. verb

to become or go unconscious, often suddenly or unexpectedly

“The boxer conked out in the ring, defeated by his opponent.”