cut one’s own throat

cut (one's) own throat

To cause problems for oneself with one's own actions (which are often motivated by anger). I know you're mad at your dad, but don't cut your own throat here—running away is only going to make your life harder.
See also: cut, own, throat
Farlex Dictionary of Idioms.

cut one’s own throat

tv. to do something that harms oneself. He’s just cutting his own throat, and he knows it.
See also: cut, own, throat
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • cut (one's) own throat
  • cut your own throat
  • be cutting (one's) own throat
  • be cutting your own throat
  • on one's own account
  • noggin
  • at will
  • chew (one's) own tobacco
  • chew own tobacco
  • of own accord