وَكَأَنَّمَا يَنْأَى بِجَانِبِ دَفِّهَا الْوَحْشِيِّ مِنْ هَزِجِ الْعَشِيِّ مُؤَوَّمِ
Her wild-side flank seems to draw away as though startled by a noisy evening creature with an ungainly great head.
Yanʾā means to move off or draw away. Daffihā al-waḥshī is the animal’s outer or wild-side flank. The poet imagines that flank withdrawing as if startled by a loud creature at dusk.
Hazij al-ʿashiyy evokes evening noise, and muʾawwam contributes the strange, heavy-headed image. Following the earlier emphasis on speed, the poet now turns to nervous responsiveness.