ἐκδῐκ-έω · ekdik-eō — LSJ
avenge, punish, φόνον Ctes. Fr. 37; παρακοήν 2 Ep.Cor. 10.6; τινάς PGen. 47.17 (iv A.D.); exact vengeance for, τὰ αἵματα τῶν δούλων LXX 2 Ki. 4.8; τὸ αἷμα τὸ ἀναίτιον SIG 1181.12 (Jewish, circ. ii/i B.C.).
decide a case, δίκην, ἀγῶνα, Ph. 2.432, POxy. 1020.6 (ii A. D.).
avenge or vindicate a person, by taking up his cause, Apollod. 2.5.11, PAmh. 2.134.10 (ii A.D.), Plu. Comp.Ag.Gracch. 5; ἑαυτούς Ep.Rom. 12.19, etc.; ἐ. τινὰ ἀπό τινος avenge one on another, Ev.Luc. 18.3: c. dat., Sch. Ar. Pl. 627:—Pass., LXX Ps. 36 (37). 28.
act as ἔκδικος II.3, AJA 18.325 (Sardes, i B. C.), cf. CIG 2824 (Aphrodisias), BCH 23.182 (Pisidia).
claim, CIG 3488 (Thyatira), Inscr.Perg. 245; σιτία καὶ ποτά Hierocl. in CA 8p.431M.
ἐ. τισί make retribution for them, Aesop. 279b.