"Crossing the Rubicon " It means to make a decision in a situation of doubt. The expression reminds of a historical fact: the decision to Julio César invade Rome with his army from the province of Gaul to the fact that the Senate supported Pompey, his rival in the civil war. César was encamped with his army on the western shore of the river Rubicon and after much thought uttered the famous phrase: "Alea iacta est ": the die is cast and crossed the Rubicon.
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