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The character 唇 evolved from ancient forms depicting the human mouth or lips. In Liushutong, L04521 shows an early seal script form that clearly represents lips. The modern meaning 'lip' comes from this pictorial origin. Over time, the character simplified while maintaining its core concept related to the mouth area. Interestingly, 唇 is also used in compounds like 唇音 (labial sounds) in linguistics, showing its continued association with lip-related meanings throughout Chinese character evolution. Arrived in Japan: The character 唇 likely arrived in Japan during the 5th-6th centuries CE along with the broader introduction of Chinese writing system through Buddhist texts and cultural exchange. It was incorporated into the Japanese kanji system and appears in early Japanese documents like the Manyoshu (8th century), though the exact date of its first appearance in Japan is not precisely documented.