ποταμῷ γὰρ οὐκ ἔστιν ἐμβῆναι δὶς τῷ αὐτῷ → it is impossible to step twice in the same river, you cannot step twice into the same rivers
obviam-itio, ōnis, f., das Entgegengehen, Cic. ad Att. 11, 16, 1 u. 13, 50, 4 (auch getrennt).
