hüübumine

Could you clarify what you mean by "hüübumine"? I want to make sure I write about the correct concept.

- Is it a real term in Estonian (and if so, in which field: biology, psychology, geology, sociology, etc.), or would you like a fictional/neutral article about a made-up phenomenon with that name?

- Do you prefer the article in Estonian or English?

- Are there any specific aspects you want included (definition, etymology, history, causes, examples, significance, references), and a target length around 200–250 words?