parting shot

parting-shot的词性：
n.（名词）

1. An act of aggression or retaliation, such as a retort or threat, that is made upon one's departure or at the end of a heated discussion.
回马枪：在某人离别时或激烈的讨论结束时的一种攻击或报复的行为，如反驳或威胁

parting-shot的词源：

2. Perhaps alteration of Parthian
可能为 Parthian的变化