Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: Rubico river in northern Italy which Julius Caesar crossed in 49BC, setting off a civil war

Rubicon

 noun
     
Ru‧bi‧con

cross the Rubicon

to do something that will have extremely important effects in the future and that you cannot change
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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