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Rubicon (n.)

in the figurative phrase cross (or pass) the Rubicon "take a decisive step," 1620s, a reference to a small stream to the Adriatic on the coast of northern Italy which in ancient times formed part of the southern boundary of Cisalpine Gaul. It was crossed by Caesar, Jan. 10, 49 B.C.E., when he left his province to attack Pompey. The name is from Latin rubicundus "ruddy," in reference to the color of the soil on its banks.

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Definitions of Rubicon from WordNet

Rubicon (n.)
the boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war;
Rubicon (n.)
a line that when crossed permits of no return and typically results in irrevocable commitment;
Synonyms: point of no return
From wordnet.princeton.edu