1.to bring a lawsuit against somebody who is suing you
1.It has since countersued, accusing Oracle of anticompetitive behaviour.
而这家公司已据此提出反诉讼，指控甲骨文（Oracle）的垄断行为。
2.Motorola subsequently countersued.
摩托罗拉随后进行了反诉。
3.In response, Apple countersued in December 2009, followed by a second round of legal action from Nokia.
作为回应，苹果在2009年12月份反击了控诉，从NOKIA跟随这二轮法律行动。
4.Samsung countersued in five other countries and the battle spread from there to several dozen cases in nearly a dozen countries.
三星则在另外五个国家对苹果提出反诉，双方之间的大战由此扩展至十多个国家，涉及数十桩案子。
5.In October, Nokia sued Apple, claiming the iPhone infringed on 10 of its patents, and Apple countersued.
今年十月份，诺基亚向苹果发起诉讼，声称iPhone侵犯了其10项专利，苹果也发起了反诉讼。
6.After ConnectU and its founders sued, Facebook countersued in 2005.
在U链接及其创办者起诉之后，2005年脸谱网反诉。
7.Infoflows countersued the same day.
Infoflows在同一天提起反诉。