"[burn] {one's} (bridges|boats)" 的定义和意义

What is the origin of the idiom "burn one's bridges" and when to use it?

The origin of the idiom "burn one's bridges" can be traced back to military strategies. In ancient times, armies would sometimes burn the bridges they crossed to prevent retreat, committing themselves fully to the battle. This act eliminated the option of turning back and forced them to move forward with determination. This idiom is used to describe a deliberate choice or action that makes it impossible to go back. It shows a commitment to moving forward without the possibility of returning to a previous state or relationship.