The Golden 80s

Is it Walk in, Walk In, or walk-in? The word, walk-in , appears as a noun and an adjective in Merriam Webster online .  I could not find the word without the hyphen. The Oxford Advanced Learners Dictionary website showed the hyphenated word only. As you know, the word means someone who walks in to a place without an appointment. Typical examples are walk-in customers for a bank, walk-in interviews for fresh graduates, and walk-in patients in a hospital.

Today, I had an interesting discussion with my colleague about the use of comma to separate adjectives. Finally, we decided to search the Internet for answers. This is what we got: ""When a noun is preceded by two or more adjectives that could, without affecting the meaning, be joined by and, the adjectives are normally separated by commas. But if the noun and the adjective immediately preceding it are conceived as a unit, such as little girl,' 'political science,' or 'glass ceiling,' no comma should be used." (The Chicago Manual of Style). That settled everything.