وَفَرْعٍ يَزِينُ الْمَتْنَ أَسْوَدَ فَاحِمٍ
أَثِيثٍ كَقِنْوِ النَّخْلَةِ الْمُتَعَثْكِلِ
“And hair adorning the back, intensely black and abundant, thick like the heavily clustered fruit bunch of a date palm.”
Farʿ here means the hair of the head, aswada fāḥim emphasizes its deep blackness, and athīth describes density. The phrase ka-qinwi al-nakhlati al-mutaʿathkil introduces a richly branched date-palm cluster as the comparison.
The subject of comparison is the hair, the comparator a dense palm cluster, and the point of resemblance is abundance and layered strands, not literal identity between hair and dates.