The idiom "Crossing the Rubicon" means to pass a point of no return, and refers to Julius Caesar's 49 BC crossing of the river-which was considered an act of war.
The idiom "Crossing the Rubicon" means to pass a point of no return. The idiom "Crossing the Rubicon" refers to Julius Caesar's 49 BC crossing of the river -. These Julius Caesar's 49 BC crossing of the river-was considered an act of war.