The phrase "sage on the stage" refers to an educator who is knowledgeable and experienced in their subject matter, and who effectively imparts that wisdom to students through teaching. The term comes from a comparison between two types of teachers - those who actively engage with their students (the guide by the side) versus those who stand at the front of the classroom and share their expertise (the sage on the stage). While both approaches have their merits, the phrase "sage on the stage" specifically refers to a teacher who is an authority figure in their field, sharing their knowledge with students through lectures or other traditional teaching methods.