In this episode of the All Ears English podcast, Aubrey and Lindsay explore the meaning, origin, and usage of the expression "run of the mill." They discuss its industrial origins, provide examples of how to use it in both casual and professional contexts, and address whether it sounds outdated. They also introduce alternative phrases like "garden variety" and "nothing to write home about" to describe something ordinary or average. The hosts share personal anecdotes, engage in a role-play to demonstrate the use of the expressions, and offer advice on how to add variety to life when it feels too routine, recommending gratitude and new experiences. They also promote the All Ears English app as a tool for language learning, highlighting its premium features like transcripts and vocabulary lists.