كَقَنْطَرَةِ الرُّومِيِّ أَقْسَمَ رَبُّهَا
لَتُكْتَنَفَنَّ حَتَّى تُشَادَ بِقَرْمَدِ
It is like a sturdy Roman-built arch whose owner has sworn that it will be enclosed and raised to completion with solid masonry and brickwork.
Qanṭarah is an arched bridge or substantial vaulted construction. Al-rūmiyy associates it with Roman building technique. The poet compares the arch’s well-fitted parts to the integrated strength of the animal’s body.
The words aqsama rabbuhā bring in an owner’s oath as a sign of determination to finish the work. Qarmad refers to hard building brick or related masonry material. The verse culminates the theme of durability and proportion.