Zonk is a verb that means to stun or stupefy.

Our word of the day seems to have no origin except that its basis is imitative, meaning the sound of the word imitates what comes to mind when people imagine it in action. To zonk means to take forceful, sudden action. A person can be zonked by another person or by a thought, for example:

After weeks for trying to figure out clues to the murder, I didn’t expect the answer to zonk me when I looked at the Bishop’s testimony. But after reading it through, it knocked me out right away.