Meanings
Refers to Julius Caesar's crossing of the Rubicon to wage civil war with Rome, on January 10, 49 BCE, in violation of law. Suetonius' use of the phrase the die is cast in describing this act popularised the use of that phrase, which was first attributed to the Greek dramatist Menander.
How to pronounce "cross the Rubicon":
AU
To make an irreversible decision or to take an action with consequences.
Example: "He knew that by coming out to his family he would be crossing the Rubicon, but he could not live a lie anymore."
Example Sentences
1
Once you make that decision, you cross the Rubicon and there is no going back.
2
They were hesitant at first, but eventually decided to cross the Rubicon and take the risk.
3
Once you cross the Rubicon of cheating, it becomes easier to justify unethical actions.