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WordReference Random House Unabridged Dictionary of American English © 2024Ru•bi•con (ro̅o̅′bi kon′),USA pronunciation n. - Place Namesa river in N Italy flowing E into the Adriatic. 15 mi. (24 km) long: in crossing this ancient boundary between Cisalpine Gaul and Italy, to march against Pompey in 49b.c., Julius Caesar made a major military commitment.
- cross or pass the Rubicon, to take a decisive, irrevocable step:Our entry into the war made us cross the Rubicon and abandon isolationism forever.
Collins Concise English Dictionary © HarperCollins Publishers:: Rubicon /ˈruːbɪkən/ n - a stream in N Italy: in ancient times the boundary between Italy and Cisalpine Gaul. By leading his army across it and marching on Rome in 49 bc, Julius Caesar broke the law that a general might not lead an army out of the province to which he was posted and so committed himself to civil war with the senatorial party
- (sometimes not capital) a point of no return
- a penalty in piquet by which the score of a player who fails to reach 100 points in six hands is added to his opponent's
- cross the Rubicon, pass the Rubicon ⇒ to commit oneself irrevocably to some course of action
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