watery grave

dance on someone's grave

To celebrate a person's death or downfall triumphantly.

dig one's own grave

To behave in a way that is likely to cause one to lose or fail, including, but not limited to, result in death.

follow to the grave

To cease existence or importance with (a person or thing) upon their passing or destruction.

silent as the grave

Saying absolutely nothing (especially about a particular subject).

take someone to the grave

To kill someone; to cause someone's death.

take to the grave

To never reveal (a secret).

turn in one's grave

To be appalled, offended or disgusted by something, despite being deceased.