«بِأَنْ يُجْعَلَ الْآخَرُ مُتَّفِقًا لَهُ فِي الِاسْمِ، ثُمَّ يُثَنَّى ذَلِكَ الِاسْمُ»
The other is treated as sharing the first one's name, and that name is then put in the dual.
Two separate members are combined under a selected familiar designation, which is then made dual. The resulting form refers to both, even though one member does not literally bear that designation as an individual name.
This distinguishes collective naming from the actual identity of each member.
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Taghlib: Dominance of Form, Meaning and Naming
«بِأَنْ يُجْعَلَ الْآخَرُ مُتَّفِقًا لَهُ فِي الِاسْمِ، ثُمَّ يُثَنَّى ذَلِكَ الِاسْمُ»
The other is treated as sharing the first one's name, and that name is then put in the dual.
Two separate members are combined under a selected familiar designation, which is then made dual. The resulting form refers to both, even though one member does not literally bear that designation as an individual name.
This distinguishes collective naming from the actual identity of each member.