sign your own death warrant

sign (one's) own death warrant

To knowingly do something that will bring one trouble, punishment, or harm (and perhaps literally one's death). If you stay out past curfew again, you know you're signing your own death warrant, right? Testifying against the mob boss is like signing your own death warrant.
See also: death, own, sign, warrant

sign your own death warrant

do something that ensures your own demise or downfall.
See also: death, own, sign, warrant

sign your own ˈdeath warrant

do something that results in your own death, defeat or failure: By refusing to play pop music this new radio station is signing its own death warrant.
See also: death, own, sign, warrant