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(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
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。