ὁνί
From LSJ
τὸν αὐτὸν ἔρανον ἀποδοῦναι → pay him back in his own coin, repay him in his own coin, pay someone back in their own coin, pay back in someone's own coin, give tit for tat, pay back in kind
English (LSJ)
Arc. for ὅδε, declined like ὁ with addition of -νί, gen. sg. masc. and neut. τωνί SIG306.14 (Tegea, iv B. C.), IG5(2).6.36 (ibid.); dat. sg. τῳνί Schwyzer 664.8(Orchom., iv B. C.), τοινί SIG559.47 (Megalopolis); acc. sg. fem. ταννί IG5(2).6.53; gen. sg. fem. τανί (i.e. Τασνί) SIG306.9; gen. pl. fem. ταννί ib.51,55; dat. sg. fem. ταινί ib.559.44; dat. pl. fem. ταιννί ib.306.55; ταινίν ib.36.
