The term MAST SUPPORT is composed of four words: STAY, SPAR, FID, and MAINSTAY. STAY is a four-letter word meaning to remain in the same place or position. SPAR is also a four-letter word meaning to engage in a mock fight or contest. FID is a three-letter word meaning a tapered pin used to secure the mast of a sailing vessel. MAINSTAY is an eight-letter word meaning a person or thing that provides essential support to something. Together, these words describe a system of support for a mast on a sailing vessel.