●play sb’s ˈgame●play the same ˈgame (as sb) ( play sb at their own ˈgame) use the same methods as a competitor, an opponent, an enemy, etc.以其之道，还治其身◆Safeway started cutting their food prices, so Asda decided to play them at their own game by cutting prices even more. 西夫韦超市开始降低食品价格，于是阿斯达超市决定以其人之道还治其人之身，降价的幅度更大。