Given the spotty screen reader support for dt/dd to begin with, I'd steer clear of using multiple `<dt>` s if a11y is top priority, and just modify your content to have one dt per dd. Your single dt text could be "X or Y", repeat the definition twice, etc.
If you're familiar with Jakob's Law, it applies to a11y too, so stick with what users might have seen on other sites.
e.g. == f.e., for example