Cross the Rubicon
Meaning
To take an irreversible step, make a final decision, or commit to a course of action from which there is no turning back.
Origin
In 49 BC, Julius Caesar faced a monumental choice at the banks of the Rubicon River. This small, unremarkable waterway marked the forbidden boundary between his province of Cisalpine Gaul and Italy proper, and the Roman Senate had expressly ordered him to disband his victorious legions before crossing it. To enter Italy with his army intact would be an act of treason, a declaration of war against the Republic he claimed to serve. Yet, after a moment of profound hesitation, Caesar uttered the legendary words, "Alea iacta est" ("The die is cast"), and led his troops across the shallow stream, initiating a brutal civil war and irrevocably changing the course of Roman history. His defiant march across the Rubicon became the ultimate symbol of an irreversible decision.
Examples
- After quitting his stable job to start a new business, he knew he had crossed the Rubicon and there was no going back.
- Once the company decided to invest heavily in the new technology, they had crossed the Rubicon and were committed to its success.