«العكس: هو رد الحكم على خلاف سننه الأول»
Aks responds to the proposed ruling by turning it in a contrary direction.
The source illustrates this with a juristic dispute about zakat on jewelry and the comparison between male and female use. The reply presses the inference in an opposing direction.
This is a specialized device in disputation over qiyas, not automatically identical to every use of “converse” in formal logic.