κατέρχεσθαι
From LSJ
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
Greek > English (Woodhouse Verbs Reversed)
(see also κατέρχομαι): be restored, come down, go down to death, return frem exile