dig one's own grave

1. 自毁生计，自掘坟墓

He has dug his own grave.

他是自毁生计。

make sb. turn in his grave

1. 使某人在九泉之下大为震惊

His behavior would make his parents turn in their graves.

他的行为会令他死去的父母在九泉之下不得安宁的。

(as) silent as the grave

1. 寂静无声的

They were silent as the grave.

他们静默着, 一言不发。