After years of war the city walls had fallen into ruin.
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圮 is literary and archaic, meaning a wall or building collapsing into ruin. In modern Chinese use 倒塌 or 毁坏 — 圮 appears only in classical texts and set phrases.
The 土 (earth) radical on the left points to earthen structures — walls, mounds, embankments — that collapse. It groups 圮 with other ground-and-building words like 城 and 堤.
