When I was young I read many comic books.
The villains were often KO’d (knocked out) by the hero or heroine.
KO’s were quite frequent in fact.
***Pow*** ***Crash*** etc.
I also saw the abbreviation OK used.
I don’t remember if someone told me, or I deduced it for myself, but I had the idea that OK was the opposite of KO.
The letters are reversed, so so is the meaning.
KO is stopped, defeated, failed…
Conversely, OK is successful, agreeable, satisfying…
I have seen many explanations bandied about, but this one to me is the most convincing.
It is OK if you wish to deliver a KO to this idea.