An oblique nominal is a °nominal that bears a flag that is not a °nominative, °accusative, °ergative or °absolutive °flag.
oblique argument (INF ) = an argument that is less salient than the core arguments of the same predication. Example: in Sally threw the letter into the wastebasket, the wastebasket is an oblique argument; it is less salient than Sally or the letter. (Sections 6.1.1, 6.2.1)