"Burned one's boats" is a phrase that refers to a situation where an individual has made a firm and irrevocable decision. If you are looking for synonyms for this idiom, some of the popular ones include "committed," "putting all eggs in one basket," "made a decisive move," "burnt bridges," and "gone all in." All these expressions point towards an act of finality. Whether it is making a career-changing decision, starting a new venture, or ending a relationship, each of these synonyms implicates a sense of irrevocability. These phrases demonstrate the importance of making a definite choice and following through with it, no matter how high the stakes may be.