burn one's bridges

burn (one's) bridges

1. Literally, to destroy a bridge or path behind oneself, so that others cannot follow. This usage is often related to military action. When the troops retreated from the area, they were sure to burn their bridges behind them.
2. To do something that cannot be easily undone or reversed in the future (often because one has behaved offensively or unfavorably). I think you really burned your bridges when you announced you were quitting and proceeded to insult your boss in front of the whole staff. She's young, so I don't think she realizes that she'll be burning her bridges if she goes to work for their competitor.
See also: bridge, burn
Farlex Dictionary of Idioms.

burn one's bridges

Also, burn one's boats. Commit oneself to an irreversible course. For example, Denouncing one's boss in a written resignation means one has burned one's bridges, or Turning down one job before you have another amounts to burning your boats. Both versions of this idiom allude to ancient military tactics, when troops would cross a body of water and then burn the bridge or boats they had used both to prevent retreat and to foil a pursuing enemy. [Late 1800s] Also see cross the rubicon.
See also: bridge, burn
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • watch (one's) six
  • check (one's) six
  • check your six
  • wash (one's) hands of (someone or something)
  • wash hands of
  • wash one's hands of
  • wash your hands of
  • wash your hands of somebody/something
  • wash your hands of something/someone
  • for sake