dig dirt about sb.
讲某人的坏话
A:He should think twice before he marries her, don't you think?
A:他在娶她之前应三思，你觉得呢?
B:Yeah, she doesn't seem to be crazy about him.
B：对，她看来不太喜欢他。
A:I don't mean to dig dirt about her, but it seems that she's just after his money.
A:我并非有意讲她的坏话，但她似乎只是为了他的钱才嫁给他的。
B:It's crystal clear to me.
B:那再清楚不过了。