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rubicon
 
Noun rubicon has 2 senses
  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
    --1 is a kind of     boundary, bound, bounds
  2. Rubicon, point of no return - a line that when crossed permits of no return and typically results in irrevocable commitment
    --2 is a kind of line, dividing line, demarcation, contrast
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