وَالْخَفْضُ فِيهِ أَكْثَرُ، نَحْوُ: «خَاتَمُ حَدِيدٍ».
Translation: The genitive construction is more common here, as in: “a ring of iron.”
«خاتمُ حديدٍ» is an iḍāfa: ḥadīdin is a genitive muḍāf ilayh rather than accusative tamyīz.
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Source: The Genitive Is More Common
At-Tamyīz: Clarifying Quantities and Sentence Relations
وَالْخَفْضُ فِيهِ أَكْثَرُ، نَحْوُ: «خَاتَمُ حَدِيدٍ».
Translation: The genitive construction is more common here, as in: “a ring of iron.”
«خاتمُ حديدٍ» is an iḍāfa: ḥadīdin is a genitive muḍāf ilayh rather than accusative tamyīz.