Possible Meanings:
* A German word: "Thun" in German means "do" or "make," but it's not used very often.
* A surname: "Thun" is a surname of German origin.
* A place name: "Thun" is a town in Switzerland.
* A slang term: "Thun" could be a slang term, but without more context, it's impossible to know its meaning.
To understand the meaning of "thun," you need more context. For example:
* What is the sentence or phrase it's in?
* What is the topic of the conversation?
* Is it used in a formal or informal setting?
Please provide more information so I can help you understand the meaning of "thun."