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壅 is a phono-semantic compound with the earth radical 土 at the bottom, indicating accumulated soil or mass, and 雍 on top providing the pronunciation. Its core meaning is the physical act of blocking or damming a pathway, originally by piling up earth to stop water flow or obstruct a route. Over time, the character's sense broadened to encompass systemic blockages , such as the obstruction of information to a ruler, clogging of bureaucratic processes, or stifling of circulation in traditional medicine. Thus, it shifted from a literal image of heaped earth to a general concept of impedance, both physical and systemic.
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