as silent as the grave 默不作声；寂静无声；守口如瓶

【例句】
After the storm the town was as silent as the grave.
暴风雨过后，镇上一片沉静。

I expected there to be someone at home, but when I returned it was as silent as the grave.
我预料会有人在家的，但当我回来的时，屋里却一片寂静，空无一人。