small river in N Italy that formed the boundary between Cisalpine Gaul & the Roman Republic: when Caesar crossed it (49 ) at the head of his army to march on Rome, he began the civil war with Pompey
Origin of RubiconClassical Latin Rubico (gen. Rubiconis)
cross the Rubicon
to commit oneself to a definite act or decision; take a final, irrevocable step
A limit that when passed or exceeded permits of no return and typically results in irrevocable commitment.
Origin of RubiconLatin Rubicō, Rubicōn-, 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.