Rubicon Meaning in the Cambridge English Dictionary
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Meaning of “Rubicon” in the English Dictionary

"Rubicon" in British English

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uk   /ˈruː.bɪ.kɒn/ /-kən/  us   /-kɑːn/
cross the Rubicon to do something that you cannot ​laterchange and will ​stronglyinfluencefutureevents: Most EU ​states have ​crossed the Rubicon and ​adopted the ​euro.
(Definition of Rubicon from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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