ἀντιπαρέχειν

From LSJ

ἄνδρες τεθνᾶσιν ἐκ χερῶν αὐτοκτόνων → the men are dead, murdered by their very own hands | dead are our chiefs by fratricidal hands | by kindred hands and mutual murder slain | their hands have killed each other

Source

Greek > English (Woodhouse Verbs Reversed)

(see also ἀντιπαρέχω): supply in return

Lexicon Thucydideum

vicissim praebere, to afford in turn, 6.21.1.