Lighthouse scans definition list elements that <dl> elements do not wrap and then flag them. Like in the example:

How to pass the audit?
You need to wrap all of the definition list elements using d1 elements. What should be in definition list items:
d1elements around the list,dtelements written for each term,ddelements specified for each definition,- One or more
ddelements written for eachdtelement.
Check out the example for more detailed information:
<dl>
<dt>Trail shoe</dt>
<dd>Extra grip for uneven, natural survaces, such as forest trails.</dd>
<dt>Road shoe</dt>
<dd>Extra cushioning for hard surfaces, such as sidewalks and roads.</dd>
</dl>