Rubicon /rooˈbi-kon or -kən/

1. A stream of Central Italy (perh the Fiumicino), separating Caesar's province of Gallia Cisalpina from Italia proper, its crossing by Caesar (49BC) being thus a virtual declaration of war against the republic
2. Hence, a point of no return
3. (without cap) in piquet, the winning of a game before one's opponent scores 100

(without cap) to defeat in this way

cross the Rubicon (figurative)

To take a decisive, irrevocable step

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