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The character 忉 is structured as a phono-semantic compound, combining the heart radical (忄) with the component 刀, which historically provided phonetic approximation while also evoking the conceptual image of a cutting feeling linked to emotional pain. Its etymology thus aligns with an original sense of acute mental distress or anxiety. This meaning has persisted through its use in classical Chinese literature, where it specifically denotes grief or worry, and the character's form has not deviated from this core composition.
Etymology Hide
