Origin of RubiconClassical Latin Rubico (gen. Rubiconis)
cross the Rubicon
Origin of RubiconLatin Rubic&omacron;, Rubic&omacron;n-, Rubicon, a short river of north-central Italy, the crossing of which by Julius Caesar and his army in 49 BC began a civil war.
From Rubicon. See cross the Rubicon.