Definition: In golf terms, "green grass" is an adjective that, when it is used, almost always precedes "pro shop" or "retail."

Green grass describes the type of retail outlet at which golf merchandise is sold. A "green grass pro shop" is one that is situated at a golf course - the on-site, clubhouse pro shop.

So "green grass" is used to distinguish between pro shops that are stand-alone retail outlets or in a shopping center, for example, and those that are located on the grounds of golf courses.

You're most likely to encounter the term when taking in news about shopping trends or statistics. For example, "Driver sales rose by 5-percent in green-grass pro shops ..." or "Super Brand X apparel is available only in green-grass pro shops ..." or "Green-grass retail sales declined in January ..."