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Definition of the Rubicon noun from the Oxford Advanced Learner's Dictionary

the Rubicon

noun
 
/ðə ˈruːbɪkən/
 
/ðə ˈruːbɪkɑːn/
[singular]
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  1. the point at which a decision has been taken which can no longer be changed
    • Today we cross the Rubicon. There is no going back.
    Topics Preferences and decisionsc2
    Word OriginFrom the Rubicon, a stream which formed the border between Italy and Gaul. When Julius Caesar broke the law by crossing it with his army in 49BC, it led inevitably to war.
brink
noun
 
 
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Danger
C2
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