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To take an irreversible, decisive step that irrevocably commits one to a specific course of action.
"By submitting his formal letter of resignation, he crossed the Rubicon."
"Signing the merger agreement meant crossing the Rubicon for both companies."
Individual vocabulary building blocks comprising this expression
In 49 BC, Julius Caesar led his legion across the shallow Rubicon river marking the border of Cisalpine Gaul into Roman territory, committing treason and triggering civil war with the words "alea iacta est" (the die is cast).
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