صدغ الحبيب وحالي كلاهما كالليالي
The beloved's side-lock and my condition are both like nights.
The line has two subjects: the beloved's side-lock and the speaker's condition. Both are likened to one comparison term, dark nights. One may suggest visible blackness and the other gloom or sorrow.
Taswiya places several subjects on an equal comparative footing with a shared model. This does not imply equality in all attributes; the equality concerns the particular aspect relevant to the comparison.