Part of speech: noun

A small river of central Italy; boundary of Caesar's Gallic province, by passing which he committed himself to a war with Pompey; hence, any act done or point passed that decides one's course beyond recall.

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Usage examples "rubicon":

  1. The first two hands were lost by Landry, who, having each time approached the " Rubicon," succeeded in avoiding it only by the greatest skill and prudence. - "Zibeline, Complete", Phillipe de Massa Last Updated: March 2, 2009.
  2. She had crossed the Rubicon of marital ethics. - "Running Sands", Reginald Wright Kauffman.
  3. What am I doing worse Than did famed Caesar at the Rubicon, When he the legions led against his country, The which his country had delivered to him? - "The Death of Wallenstein A Play", Frederich Schiller.