The term "more uppercrust" often refers to something that is considered high-class, posh, or elite. Some antonyms that can be used to describe the opposite of this term include "down-to-earth," "humble," "plain," or "unrefined." These words suggest a simpler or more modest lifestyle, rather than one that is extravagant or luxurious. Other antonyms might include "common," "ordinary," or "working-class," which emphasize the idea of being regular or normal, rather than exceptional or exclusive. By using these antonyms, we create a contrast between the high-end and the low-end, or the exclusive and the inclusive, highlighting the diversity of society and the many different lifestyles that can exist within it.