dig (one's) own grave

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Related to digging own grave: turn over in grave, turning in grave, roll in grave

dig (one's) own grave

To do something that has or will have negative consequences that are easily able to be foreseen. If you don't turn in your project, you're digging your own grave. There's no way you'll get a decent grade without it! I'm afraid I'm digging my own grave by turning down the promotion.
See also: dig, grave, own