This podcast episode explores the importance of knowing outdated idioms in English and emphasizes the need to ask native speakers about their usage. The speakers discuss the challenges of determining whether an idiom is outdated and highlight the significance of understanding idioms beyond their literal meanings. They provide tips on how to ask native speakers about the usage of idioms and emphasize the importance of cultural awareness and context. The episode also discusses how to navigate the ever-changing language landscape and approach native speakers for help in a natural and respectful manner, focusing on human connection rather than viewing the teacher as a tutor.