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
alce alces N F :: elk
(2) alce2, s. alces.
ἄλκη
(2) alcē, ēs, f., c. alces : Sol. 20, 6.