جَاءَنِي زَيْدٌ أَخُوكَ — Zayd, your brother, came to me.
The coming is attributed to the same individual. Zayd is mentioned first, and your brother supplies the intended appositional identity.
This does not add a second visitor. It re-identifies the single person.
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Badal: Definition, Four Types, and Parsing
جَاءَنِي زَيْدٌ أَخُوكَ — Zayd, your brother, came to me.
The coming is attributed to the same individual. Zayd is mentioned first, and your brother supplies the intended appositional identity.
This does not add a second visitor. It re-identifies the single person.