وَكَأَنَّمَا تَطِسُ الْإِكَامَ عَشِيَّةً بِقَرِيبِ بَيْنَ الْمَنْسِمَيْنِ مُصَلَّمِ
As it strides over the mounds in the evening, it seems like an ostrich whose feet are set close together and whose ears seem cropped.
Wa-kaʾannamā introduces a comparison: the camel’s lively progress is seen through the form and footwork of an ostrich. Al-mansimayn denotes the two foot-points in this animal vocabulary, and qarīb bayna al-mansimayn conveys their closeness.
Muṣallam means cropped-eared. Here it supplies a physical feature within the animal simile, not a judgment about a person. Distinctive anatomy helps the poet make speed visible.