δύῃ

From LSJ

ἄνω ποταμῶν ἱερῶν χωροῦσι παγαί → the springs of sacred rivers flow upward, backward to their sources flow the streams of holy rivers

Source

French (Bailly abrégé)

3ᵉ sg. sbj. ao.2 de δύω.

Russian (Dvoretsky)

δύῃ: Hom. 3 л. sing. opt. к δύω I.