κερουτιᾶν
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: κερουτιάω) lift up one's horn, toss the head