The pot calling the kettle black.

something you say that means people should not criticise someone else for a fault that they have themselves

五十步笑百步，半斤八两，彼此彼此

• Elliott accused me of being selfish. Talk about the pot calling the kettle black!艾利特责备我自私，真是以五十步笑百步。
• Don't tell me I should stop smoking when you smoke, too! That's the pot calling the kettle black!你自己明明就有抽烟，就不要叫我戒烟了！咱们俩其实是半斤八两！

【来源解析】

在过去，无论是锅还是水壶，都要放在炉子上面，所以难免两者都变得黑乎乎的。所以还是很好理解的啦。

【引申】

英文惯用语里面类似"以五十步笑百步"的成语也很多。我总喜欢吐槽Mr F一有时间就抱着手机玩游戏，他每次都愤愤不平，说我无时无刻不玩手机。然后，他就会说他最喜欢的一句格言来"教导"我：

People who live in glass houses shouldn't throw stones.

要批评别人之前要先检讨自己是不是也有过失，以五十步笑百步

• Zac told me I had a bad taste in music. I replied by telling him that people who live in glass houses shouldn't throw stones.Zac 认为我对音乐的品味很差，我回复他说你也没有好到哪里去。
• You should have invested your time wisely, but I am one who lives in a glass house so I ought not to criticize.你应该好好善用时间，但是我自己也是一样，所以我没有资格说你。

【解析】

看字面意思的话，这句话的意思是：住在玻璃屋里的人不要砸石头。你如果想用石头攻击别人，那肯定会把自己的玻璃屋打碎。隐喻为：既然你自己也好不到哪里去，就不要再去厚着脸皮对别人指手画脚了。