Definition of "rubicon" []

• A limit that when exceeded, or an action that when taken, cannot be reversed. (noun)

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• "The original form of the game, piquet au cent, is now obsolete, having been displaced in the late nineteenth century by the present game, technically known as rubicon piquet."
• "In his answer he describes the “constitutional rubicon” as"
• "Wherever you stand on the Premier League's role in the endtimes, though, you have to concede Mark's emergence as a spokesmodel crosses a rubicon for sporting officialdom."