Which grammatical/linguistic descriptor does not apply to the term, “helter-skelter”?

I still don't get it

I've been teaching high school English for 23 years, but I still missed this one! I'm quite certain anyone can have a happy and successful life without ever needing to know this much detail about English linguistics. 😉

Scotti, I am also an English teacher and I love the detail and grammar in this question. While no one NEEDS to know this much, it doesn’t mean it’s not fascinating to some. 😛

these are all types of expressions or multiword idiom ... collacation means the words have similar meaning , repetition for effect . I think it's wrong , collacation is mutually exclusive with irreversible binomial ....

I’m sorry I didn’t study language development.

We really don't know the English expression