sign your own death warrantsign (your) own death warrant
to do something which will stop you from being successful.
The company signed its own death warrant by choosing to remain independent rather than going into partnership.
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.
sign your own death warrant
do something that ensures your own demise or downfall.
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.