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
ὕπεας: и ὕπεαρ, атт. * ὄπεας, ατος τό шило Her.
τό, f.l. statt ὄπεας Her. 4.70.