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ἀνέπεσον

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

Source

French (Bailly abrégé)

v. ἀναπίπτω.

Russian (Dvoretsky)

ἀνέπεσον: поздн. ἀνέπεσα aor. к ἀναπίπτω.