counterpart
From LSJ
Χρὴ τῶν ἀγαθῶν διακναιομένων πενθεῖν ὅστις χρηστὸς ἀπ' ἀρχῆς νενόμισται → When a good man is hurt, all who would be called good must suffer with him
English > Greek (Woodhouse)
substantive
P., use adj., ἀντίστροφος.
music was a counterpart of gymnastic: P. ἦν (μουσική) ἀντίστροφος τῆς γυμναστικῆς (Plato, Republic 522A).