"Burn one's boats" is a figurative phrase that means to eliminate all possibility of turning back or giving up a course of action. This phrase originated from the military tactic of burning one's boats after landing on enemy territory, which meant that the soldiers had no option but to fight with all their might to win the battle. There are several synonyms for this phrase, including "cutting off all escape routes," "going all-in," "committing fully," "taking a leap of faith," "risking everything," "burning bridges," and "making a decisive move." All of these expressions convey the idea of making a bold and risky decision while being fully committed to its outcome.