αμοιβαδόν

From LSJ

τίς ἐς σὸν κρᾶτ' ἐπύκτευσεν → who hit you with the fist on the head, who has been pummeling your head

Source

Greek Monolingual

(Α ἀμοιβαδὸν) επίρρ. ἀμοιβή
αμοιβαία, εναλλάξ, διαδοχικά.