بل بغيره بأن يكون تابعاً له في التحيز
Rather, it subsists in another by depending on it with respect to spatial occupancy.
Taḥayyuz concerns being related to a spatial locus. For some accidents, their spatial attribution follows that of the substance or body bearing them: the color of a surface is attributed to that surface rather than assigned an independent material location.
This does not make color another tiny body. Spatial dependence describes the way the accident belongs to its bearer; it is not a definition of a separate material constituent.