Rubicon 
Rubicon definition
Ru·bi·con (ro̵̅o̅′bi kän′)
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
Etymology: L Rubico (gen. Rubiconis)
Rubicon Idioms
cross the Rubicon
to commit oneself to a definite act or decision; take a final, irrevocable step
Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.
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