وَأَمَّا الْعَطْفُ أَيْ جَعْلُ الشَّيْءِ مَعْطُوفًا عَلَى الْمُسْنَدِ إِلَيْهِ فَلِتَفْصِيلِ الْمُسْنَدِ إِلَيْهِ مَعَ اخْتِصَارٍ
As for coordinating something with the subject, its purpose is to detail that subject with brevity.
جَاءَنِي زَيْدٌ وَعَمْرٌو
Zayd and ʿAmr came to me.
The conjunction «wa» joins two individuals while one predication applies to both. Saying «Zayd came and ʿAmr came» would repeat the verb; coordination provides enumeration within one compact clause.
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ʿAṭf al-Bayān, Badal and Coordination: Clarifying, Reinforcing and Specifying the Subject
وَأَمَّا الْعَطْفُ أَيْ جَعْلُ الشَّيْءِ مَعْطُوفًا عَلَى الْمُسْنَدِ إِلَيْهِ فَلِتَفْصِيلِ الْمُسْنَدِ إِلَيْهِ مَعَ اخْتِصَارٍ
As for coordinating something with the subject, its purpose is to detail that subject with brevity.
جَاءَنِي زَيْدٌ وَعَمْرٌو
Zayd and ʿAmr came to me.
The conjunction «wa» joins two individuals while one predication applies to both. Saying «Zayd came and ʿAmr came» would repeat the verb; coordination provides enumeration within one compact clause.