What does "unoverthrown" mean?

The term "unoverthrown" is not a commonly used word in English. However, based on the context of your question, I can infer that you might be asking about the opposite of "overthrown."

If something is overthrown, it means that it has been defeated or replaced by another entity or force. Therefore, if something is unoverthrown, it suggests that it has not been defeated or replaced, and it remains in power or control.

For example, if a government is unoverthrown, it means that it has not been overthrown or toppled by a revolution or coup. Similarly, if a king or queen is unoverthrown, it means that they have not been dethroned or deposed.

In summary, "unoverthrown" refers to something that has not been defeated or replaced, and it remains in power or control.