圾jī

垃圾 (lājī, "trash") is where 圾 (jī) lives almost exclusively, the earth radical 土 suggesting waste returning to the ground while 及 provides the sound. It emerged as a twentieth-century simplification, though the word itself dates back centuries, originally describing scattered refuse. The character is modest in its duties, appearing in only a handful of compounds but serving an essential role in everyday Chinese.