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Rubicon

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Rubicon
Rubicon /ˈruːbɪkən, -kɒn $ -kɑːn/ noun
 Date: 1600-1700
 Language: Latin
 Origin: Rubico river in northern Italy which Julius Caesar crossed in 49BC, setting off a civil war
cross the Rubicon to do something that will have extremely important effects in the future and that you cannot change