Dig your own grave

Pro Tip 1/3

Negative Outcome

Used when an action will likely lead to a bad result, often by one's own doing.

Ignoring her warnings, you're really digging your own grave.

Pro Tip 2/3

Self-Inflicted Trouble

It emphasizes trouble that you bring onto yourself, not caused by others.

By betraying his team's trust, he was digging his own grave.

Pro Tip 3/3

Idiomatic Caution

Used to advise someone against a course of action that seems harmful.

If you cheat on the test, you're digging your own grave.