avenge
avenge \*-'venj\ vt [ME avengen, prob. fr. a- (as in abaten to abate) + vengen] to avenge, fr. OF vengier - more at VENGEANCE 1: to take vengeance for or on behalf of 2: to exact satisfaction for (a wrong) by punishing the wrongdoer lf or another. AVENGE implies inflicting just or merited punishment esp. on one who has injured someone other than oneself; REVENGE implies getting even or paying back in kind or degree - aveng.er n SYN syn AVENGE, REVENGE mean to punish one who has wronged onese
Webster's English Dictionary