Al-kūr denotes the saddle or riding apparatus fitted to a camel, and wāsiṭ its raised central area. Ḍabʿ concerns the upper forelimb; bi-ḍabʿayhā is dual after the preposition, with a feminine possessive pronoun.
Al-khafaydad refers to the ostrich, an established image of rapid running. ʿĀmat need not indicate literal swimming in water. Here it represents the flowing, vigorous movement of the legs during a fast run.