The noun has to do with death, as I understand it.
"Beyond the pale" is perhaps the famous phrase, one which I believe has something to do with, "beyond the cold, soft, grasp of death".
🫠
I look forward to guessing the actual definition of this word.
Not quite... in fact pretty much just plain "Not". 😉
If it has come to be used that way, it is as incorrect as , say, using "imply" when the word you should be using is "infer".
That is. the misuse of it has become "normalized", such that the true meaning has been been kicked into the basement and is now gathering dust.
However,
abusus non tollit usum. The abuse of something does not take away the [proper] use of that thing.
You did correctly guess the phrase where it most commonly appears; in fact where it appears about 99% of the time.
Yet I can see why the definition you posted seems correct, which is due to conflation of phrases and also that some words can be "false friends".
OK, a clue (or two) ... the word "pale" has two totally disparate meanings because it really is two different words that happen to be spelled the same way.
Pale: washed out wan look relating to the appearance of something is a variation of our word
pallid, which closely resembles the original Latin word
pallidus (adj, -a-um) meaning...pale!
Now, the phrases "deathly pale" or "pale as death" are common enough. Also Death is portrayed riding Pale
horse, the imagery coming directly from the Bible's Book of Revelation, (with its Four Horsemen of the Apocalypse).
Pale: a pointed piece of wood used in making a fence (not a "picket" but it does serve the same purpose).
Pale also comes from to us via Latin:
palus (noun)
, a stake, post
A bunch of pales attached together is a
paling and so serves as a fence; that is, a boundary.
So there are your clues... jettison one meaning of
pale and you will be left with real meaning of the phrase "beyond the pale."