Homonym: underground (Subterranean)
The term "underground" refers to anything located beneath the surface of the earth. This can include natural formations like caves and tunnels, as well as human-made structures such as subways and basements. Underground spaces are often used for various purposes, including storage, transportation, and even living quarters.
In a cultural context, "underground" can describe movements or scenes that exist outside mainstream society. This includes underground music, art, and literature that challenge conventional norms. These underground movements often promote alternative ideas and foster creativity, providing a platform for voices that may not be heard in the mainstream.