This podcast episode answers a listener's question about compound adjectives in English. The hosts explain the rules for using hyphens in compound adjectives, particularly when they precede the noun they modify (e.g., "well-known," "high-pitched"). They provide examples using numbers and measurements and demonstrate how to create original compound adjectives, emphasizing that experimentation is key to mastering this aspect of grammar. Listeners learn that hyphens are used to connect words in compound adjectives before the noun, and that they can create their own compound adjectives using various formulas. The episode concludes with a role-play showcasing the use of compound adjectives in a natural conversation.