About
辊 (simplified) or 輥 (traditional) is a phono-semantic compound. Its semantic radical 车 (traditional 車, "vehicle") on the left links the meaning to wheels, rotation, or machinery, while the right-side component 昆 provides the phonetic cue. Originally, it described the continuous spinning motion of wheels or cart components. As industrial technology advanced, its usage narrowed to specifically denote a cylindrical mechanical part, a roller or cylinder used in machinery to press, flatten, or move materials.
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