Does sand have two meanings?

Yes, sand has many meanings beyond just the granular material, and it definitely has more than two meanings in English. As a noun, the primary meaning is loose granular material made of finely divided rock and mineral particles found on beaches, deserts, and riverbeds. As a verb, to sand means to smooth or polish a surface with sandpaper or sanding equipment, as in sand the wood. In slang, sand can mean courage or grit, as in he has a lot of sand. In construction, sand is a material but also a verb for adding sand to a mixture. As an abbreviation, SAND can stand for various organizations. In card games, sandbagging means to hold back. In computing, S and S are not related. Sand also appears in place names and surnames. In British slang, to sand means to add sugar to something. The word also has metaphorical uses like sands of time meaning the passage of time. So sand has multiple noun meanings, verb meanings, and idiomatic meanings like pound sand meaning go away, and to be sandwiched is not related. Therefore sand has far more than two meanings, including material, action, courage, and idiomatic expressions, making it a polysemous word with many definitions in the dictionary.