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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无法退回的界限；界线
    • Today we cross the Rubicon. There is no going back.今天我们要破釜沉舟，背水一战了。🔊🔊
    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.