The term 'rubicon' originates from Julius Caesar's irreversible step of crossing the Rubicon river, a historical event.

Historical Reference

'Rubicon' signifies a decision made is final and there's no going back.

Irreversible Action

Often used metaphorically to express a critical decision or action with far-reaching consequences.

Metaphorical Use

 women had earned the right to kick back and relax during moments of national crisis but they wouldn't when they saw the television images of the tornadoes aftermath they knew they had to help I spent several days accompanying the team rubicon volunteers