What is "substantive case"

n. (context grammar English) A case of second objects, being a derivation of the comparative case but intended for larger, more substantial objects, and used to join or combine one thing with another. It corresponds roughly to a variation of the accusative case: ''I understood him'' (him in the substantive case rather than the accusative, since no action is performed on the object). Languages that use the substantive case include Chechen and Ingush.