The expression “crossing the Rubicon” is a commonplace in educated discourse, in the sense that one has arrived at a point of no return. This is of course its figurative meaning, and here is a Cultural Literacy worksheet on the Rubicon River that will help your students understand the literal meaning of this expression–you know, Julius Caesar and all that.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.
Mark's Text Terminal 
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