Antiptosis, which literally translates to the `exchange of case`, is a rhetorical device. Specifically, it is a type of enallage (the substitution of grammatically different but semantically equivalent constructions) in which one grammatical case is substituted for another. Although possible in English, the device is much more effective in langu.....
• (n.) The putting of one case for another.
An`tip·to'sis noun [ Latin , from Greek ...; ... against + ... a falling, a case, ... to fall.] (Gram.) The putting of one case for another. 
The substitution of one case for another.