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檩 is a phono-semantic compound: the wood radical 木 (mù) places it in the realm of timber and wooden construction, and 禀 (bǐng) indicates its sound. The character refers to a purlin, a horizontal wooden beam (or pole) that runs the length of a roof, resting on the principal rafters to carry the roofing materials. It is an architectural and carpentry term, naming a vital structural component in traditional timber-framed buildings. The word has no metaphorical or abstract meanings, remaining strictly confined to its literal, utilitarian sense in construction.
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