ἀντοφείλειν

From LSJ

αἰὲν ἀριστεύειν καὶ ὑπείροχον ἔμμεναι ἄλλων → always strive for excellence and prevail over others (Iliad 6.208, 11.784)

Source

Greek > English (Woodhouse Verbs Reversed)

(see also: ἀντοφείλω) owe in return

Lexicon Thucydideum

accepti beneficii gratiam debere, to owe thanks for a favor received, 2.40.4.