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English definition of “Rubicon”

Rubicon

noun uk   /ˈruː.bɪ.kɒn/ /-kən/ us    /-kɑːn/
cross the Rubicon to do something that you cannot later change and will strongly influence future events: Most EU states have crossed the Rubicon and adopted the euro.
(Definition of Rubicon from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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