ἐπακρίζω
From LSJ
ἄνω ποταμῶν ἱερῶν χωροῦσι παγαί → the springs of sacred rivers flow upward, backward to their sources flow the streams of holy rivers
English (LSJ)
A reach the top of a thing, πολλῶν αἱμάτων ἐπήκρισε ( ἐπ' ἄκρον ἦλθε, Sch., τέλος ἐπέθηκεν, Hsch.) he reached the farthest point in deeds of blood, of Orestes, A.Ch.932.