المنقول العرفي باعتبار كون الناقل عرفا عاما
Customary transfer occurs when general usage brings about the change in meaning.
The book uses “dābbah” as an example: its earlier broad sense related to moving creatures on earth, while later customary usage came to favor a narrower class of animals.
The point is not that the senses are unrelated. Rather, a social convention changes which meaning is normally intended. Transfer by common usage must be distinguished from transfer grounded in religious law or specialist terminology.