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noun

  • The boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war.
  • A line that when crossed permits of no return and typically results in irrevocable commitment.
by WordNet 3.0 © 2006 by Princeton University
(n.) A small river which separated Italy from Cisalpine Gaul, the province alloted to Julius Caesar.
by Webster's Revised Unabridged Dictionary