to talk about something in a way that makes it seem less important or less serious than it really is

He began his lecture by talking down the initiatives of a rival company. 他在讲座一开始就贬低竞争对手的计划。

to speak loudly or without stopping to prevent someone else from speaking

I tried to explain, but he just talked me down. 我想解释一下，但他根本不让我插话。

to persuade someone that he or she is wrong or should not act

Just as soon as the President voiced his dissent, his advisors talked him down. 总统刚出声表示异议，他的顾问就立刻说服他打消这个念头。

to persuade someone who is threatening to kill himself or herself not to jump from a high place

The policeman talked the girl down after she had been on the roof for two hours. 那个女孩在屋顶上呆了两小时后，终于被警察劝了下来。