Rubicon definition by Webster's New World
Origin: Classical Latin Rubico (gen. Rubiconis)
Rubicon definition by American Heritage Dictionary
Origin: Latin Rubicō, Rubicōn-, Rubicon, a short river of north-central Italy, the crossing of which by Julius Caesar and his army in 49 B.C. began a civil war.
Rubicon - Cultural Definition
A river in northern Italy that Julius Caesar crossed with his army, in violation of the orders of the leaders in Rome, who feared his power. A civil war followed, in which Caesar emerged as ruler of Rome. Caesar is supposed to have said, “The die is cast” (referring to a roll of dice), as he crossed the river.
- “Crossing the Rubicon” is a general expression for taking a dangerous, decisive, and irreversible step.
rubicon - Phrases/Idioms
cross the Rubicon