ἀνταποθνήσκω
From LSJ
κρείσσων ἐναρχόμενος βοηθῶν καρδίᾳ τοῦ ἐπαγγελλομένου καὶ εἰς ἐλπίδα ἄγοντος· δένδρον γὰρ ζωῆς ἐπιθυμία ἀγαθή (Proverbs 13.12 LXX) → One who sincerely sets about helping is better than one who makes promises leading to hope; for a kindly urge is a tree of life.
English (LSJ)
A die or am killed in requital, ἀνταποθανεῖν τὸν ἀποκτείναντα Antipho 5.10; τοῦ ἐμψύχου δόγματος ὃ ἀνεῖλε Ph.1.94.