“shut up”是闭嘴的意思，那“shut down”呢？

shut down( Informal)：stop from doing or saying something:

停工;完全关闭;停下；<非正>阻止去说，或做某事

After the second explosion, all of London's main train and subway stations were shut down 

第二次爆炸后，伦敦所有的主要火车站和地铁站都关闭了。

《柯林斯高阶英汉双解学习词典》

We had a plan. Help Linda and Tulio find the flock and get home. But when I mentioned it to her, she completely shut me down.

我们本来有计划的。帮助Linda和Tulio 找到鹦鹉，然后回家。可是我跟她说时，她根本就不让我说。

听写练习

Look, this thing is impossible to shut down.

听着，这东西不可能关掉。