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English definition of “Rubicon”

Rubicon

noun     /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 .Not able to be changedKeeping and staying the same
(Definition of Rubicon noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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