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noun


(1)   A line that when crossed permits of no return and typically results in irrevocable commitment
(2)   The boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war
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Proper noun


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  1. An ancient Latin name for a small river in northern Italy which flows into the Adriatic Sea. It marked the boundary between the Roman province of Gaul and the Roman heartland. Its crossing by Julius Caesar in 49 BC began a civil war.
 
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