The word "囚禁" is formed by combining the character "囚", which pictographically depicts a person inside an enclosure, meaning "to imprison", with the character "禁", composed of "林" (forest) over "示" (altar), originally conveying the idea of a taboo or prohibition. Together, "囚" provides the core concept of confinement, while "禁" intensifies it with a sense of enforced restriction, resulting in the meaning "to imprison" or "to confine".