ἀνταδικεῖν
From LSJ
Ῥῦσέ με δεινῶν νοσημάτων, ἱερώτατε, ἱερωσύνην συναρμόσας ἐν χαρᾷ και ἐπιστήμης τὸ πολύτιμον κεφάλαιον → Deliver me from grievous afflictions, most holy one, joining sanctity together in joy with the precious fountainhead of knowledge
Greek > English (Woodhouse Verbs Reversed)
(see also: ἀνταδικέω) injure in return, requite a person with evil, retaliate upon, wrong in return