avenge a friend 为朋友报仇
avenge a death 为死者复仇
seek revenge 寻求报复
take revenge 报仇
settle a score 算账
justice is served 正义得到伸张
A: Why did he confront them?
A：他为什么去找他们对峙？
B: He avenged his friend who was treated unfairly.
B：他为受到不公平对待的朋友报了仇。
1) 为受到伤害的人或事进行报复
2) 通过行动伸张正义或讨回公道
3) 对不公或损失进行回应性惩罚
1. 为……报仇；复仇
2. 替……伸张正义
verb
1. To inflict harm or punishment in return for an injury or wrong done to oneself or another.
Synonym: retaliate, revenge