Definition
To defeat someone by using the same methods or tactics that they have tried to use against you; to turn someone's strategy against them.
以其人之道，還治其人之身
He tried to spread rumors about me, but I beat him at his own game when I started sharing the truth about him.
他試圖散播關於我的謠言，但當我開始分享關於他的真相時，我以其人之道還治其人之身。
Their company has been gaining customers with false advertising, but our new ads reveal their tricks. It's a case of beating them at their own game.
他們公司一直用虛假廣告吸引客戶，但我們的新廣告揭露了他們的伎倆，這就是以其人之道還治其人之身。
She always criticizes other colleagues’ work, but I beat her at her own game when I evaluated her own report with her standards.
她總是批評其他同事的工作，但當我用她的標準來評估她的報告時，我以其人之道還治其人之身。