the Rubicon
noun/ðə ˈruːbɪkən/
/ðə ˈruːbɪkɑːn/
[singular]- 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。
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. - Today we cross the Rubicon. There is no going back.