Hi @YuQinCai, @Constance_Fang @Fiona and the ChinesePod team, my question is this:
中文怎麼說：“to have something on someone”? 比方說如果你可以透露一個人的老底, you have something on him.
I think the word you’re looking for is 抓(住)把柄。This is covered in the lesson, 《小太监进宫五》。Here’s one of the example sentences:
Once she’s got something on you, the good times are over for you.
Thank you for your response. This expression is pretty much in the news these days.