Which word refers to a downstairs area?

The word "below" is commonly used to refer to a downstairs area, especially in nautical contexts. In maritime language, "below" signifies any space beneath the main deck of a ship. This terminology is important as different levels within a ship have specific functions, often called out as tracts for crew and cargo-related activities.

Using "below" to denote a downstairs area fits the standard nautical vernacular, making it the most suitable choice in this scenario. The other options either refer to actions or concepts not related to location, such as "cast off," which relates to the act of releasing lines or ties on a vessel, "carry on," which often refers to continuing an activity or transporting items, and "brightwork," which pertains to polished metal fittings on a ship rather than indicating physical location. Thus, "below" distinctly captures the essence of a downstairs space.