How to associate string with individual use of taxonomy term

I recommend using the Co-Authors plugin instead of building your own solution. That way, you use the existing WordPress user roles (Editor, Author, etc).

You’ll then need to edit your theme’s template to show multiple authors. The plugin author provides documentation on how to do this though.

Update – added more details based on comment below.

For example

You would edit your single.php template and replace the_author() template tag with coauthors().