ἀντιδιδόναι
From LSJ
ταῦτα δηλώσω αὐτός τε νοσήσας καὶ αὐτὸς ἰδὼν ἄλλους πάσχοντας → I shall describe those symptoms, since I myself had the disease and witnessed as well what others were suffering
Greek > English (Woodhouse Verbs Reversed)
(see also ἀντιδίδωμι): give in exchange, give in return, give instead, pay back
Lexicon Thucydideum
referre, rependere, to return, repay, 3.63.4,
PASS. 1.41.1, 3.40.3,
poenas vicissim dare, to inflict punishment in turn, 2.53.4,
idem, the same 3.66.3.