Pain in the English

I’m looking for a phrase or idiom that conveys the same sense of wild goose chase or false lead as a red herring, but that is not placed intentionally. A red herring is necessarily an attempt to mislead. I’m looking for a phrase that can apply if the distraction is unintentional.

The first time I heard the phrase “went missing” was a few years while watching a national news broadcast. The new reporter interviewed a midwestern sheriff about the case of a missing girl. He said she “went missing eight days ago”. I assumed it was a colloquialism (and very poor grammar).
Now I hear it and read it quite frequently. Where did this strange expression come from? How can someone “go” missing? Shouldn’t it be “disappeared”? Or perhaps, “has been missing”?

It sounds to me as if this term is descended from “What it is”, a Black-American expression that goes back to the 1960s. Then it meant, “It’s part of The System”, or “It’s just part of how African-Americans have to live in the USA”, implying restriction, being the object of racism and prejudice, and adopting a philosophical and pragmatic way of living under pressure. “What it is” seemed to come from late 1960s black culture, including the Black Panthers, so-called “soul music” and more. It might come from a song. I only heard black people say it, never anyone else, and it was an expression of positive resignation, as if it also meant, “We can’t change that but we will move forward anyway.” Now, 45 years later, “It is what it is”, sounds like a more vague descendent. I think it’s weaker and less compelling because it sounds artificial, as if a movie screenwriter created it. Again, I dislike the vagueness of it, especially because wen people say it, they seem to imply it explains something, which it does not. It seems to be a weak vulgar shrug uttered by those who don’t know what else to say, and are baffled or confused themselves. I’d accept it from African-Americans, who might catch a subtlety or a meaning I don’t. But now I’ve heard it from 2 highly educated white friends, and it sounds phony coming from them.
WHAT DOES IT MEAN AND IS IT EVER VALID OR WORTHWHILE?

I’m curious as to the origin of the phrase “…not that there’s anything wrong with that.”

I have a vague recollection of hearing it for the first time — possibly in a comedian’s act? — many years ago, clearly in the context that it now seems to ubiquitously have: a reference to homosexuality. For the life of me, I cannot recall who it was I first heard say this. I do seem to recall that it was long before Seinfeld made it popular.

Does anyone else have a similar memory?

Normally, I would say “Williams had 4 singles for the day,” but many sportscasters use “ON the day” instead. Does anyone know the origin of this use? The editor of an online baseball encyclopedia had no idea, so I’m not sure where to go for an answer.

I’m a new editor and am confused about the use of “condition”.
If it is used to describe a strict experimental condition, is only “on condition that” can be used, but not “under the conditions of”?
A senior editor tells me that the latter can not be used to describe experimental conditions, and if one really wants to use it, he/she should change the prep. into “on”. However, there is no such saying as “on the conditions that” in a dictionary(Longman).
Looking forward to correct explanation.

This Japanese program claims that Peter Pan regularly killed children when they grew too old. Here is the paragraph from the original book by James Matthew Barrie:

All wanted blood except the boys, who liked it as a rule, but to-night were out to greet their captain. The boys on the island vary, of course, in numbers, according as they get killed and so on; and when they seem to be growing up, which is against the rules, Peter thins them out; but at this time there were six of them, counting the twins as two.

The controversial phrase here is “thins them out”. How would you interpret it?

Since I’ve moved to North Carolina I have heard many people say “Cut on/off” the power or lights or any electronic device, and I’m very curious as to why.

Could you please tell me what it means if someone calls you “green eyes”, but you don't actually have green eyes.

We're trying to figure out if it means envy/jealousy, being temperamental, or something else?