What is gender polarity in Cushitic and Semitic languages?

In Afro-Asiatic languages, gender polarity is a morphological feature where a noun changes its grammatical gender when transitioning from the singular to the plural form.1

While many Afro-Asiatic languages maintain a consistent masculine or feminine gender for nouns, this specific phenomenon is observed in both Cushitic languages and Semitic languages. For example, in the Cushitic language Burunge, the noun kori ("year") is masculine, but its plural form korara ("years") is feminine.1

In some Cushitic languages, such as Somali and Rendille, this gender shift is a recognized grammatical characteristic. In the broader context of these language families, gender polarity serves as a distinct way of marking number and gender agreement, contrasting with languages that maintain gender stability or utilize a common gender for all plural nouns.21