Here is a Cultural Literacy worksheet on the Sword of Damocles. This expression, which comments on the ever-present danger to those in power from their courtiers. You’ll hear this turn up occasionally as an idiom in educated discourse.
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.