What is what does rubicon mean?

Rubicon is a river in northeastern Italy that Julius Caesar crossed with his army in 49 BC, while he was on his way to Rome. The phrase "crossing the Rubicon" is often used to mean passing a point of no return, or taking irreversible action. It signifies a decision that cannot be undone, and therefore carries significant risk. The phrase is often used in politics, business, and other areas where bold decisions are made. The term Rubicon is now commonly used to refer to any similar boundary or point of no return.