Rubicon

Ru·bi·con  (rb-kn)

n.

A limit that when passed or exceeded permits of no return and typically results in irrevocable commitment.

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[Latin Rubic, Rubicn-, 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.]

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Rubicon [roo-bik-on]

Noun

cross the Rubicon to commit oneself to a course of action which cannot be altered [a stream in N Italy: by leading his army across it, Julius Caesar caused civil war in Rome in 49 bc]

Thesaurus

Noun	1.	Rubicon - the boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war
	2.	Rubicon - a line that when crossed permits of no return and typically results in irrevocable commitment point of no return dividing line, demarcation, contrast, line - a conceptual separation or distinction; "there is a narrow line between sanity and insanity"