stonewall
verb [ I or T ] uk/ˈstəʊn.wɔːl/ us/ˈstoʊn.wɑːl/
（以拒绝回答问题或阻止他人发表意见等方式）阻碍（议事），（为）（讨论）设置障碍
to stop a discussion from developing by refusing to answer questions or by talking in such a way that you prevent other people from giving their opinions
The interviewer accused the minister of stonewalling on the issue of tax increases. 采访者指责部长闭口不谈增加税收的问题。