混凝土
hùnníngtǔ · HSK 7
concrete
🧱 混凝土 = mix (混) + congeal (凝) + earth (土) — what hardens into concrete
混 means to mix, 凝 means to congeal or set, and 土 means earth or soil. Wet earthy slurry that mixes and sets hard: concrete.
混 — water radical 氵 + 昆 (kūn, phonetic)
A semantic-phonetic compound: 氵 (water) gives the meaning, while 昆 supplies the sound. The original sense was waters mingling or flowing together, which extended to 'mix, blend, confuse.' Modern uses like 混乱 (chaos) and 混合 (to mix) preserve this core idea of things merging.
土 — pictograph of a mound of earth on the ground
土 is a pictograph showing a lump or mound of soil resting on the ground line. In oracle bone script it depicted an earthen heap, sometimes interpreted as an altar to the earth god. The meaning has remained stable: earth, soil, or ground.