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The character 薄 (bó/báo) evolved from ancient pictographs representing lush vegetation growing near water. Its composition combines the radical for grass/plants (艹) at the top with the phonetic component 溥 (pǔ) below, which itself contains water (氵) and the character 尃. Originally meaning 'thin' or 'light,' it also came to mean 'insignificant' or 'to approach.' The character appears in early Chinese texts like the Shijing (Classic of Poetry) describing thin mist or light dew, reflecting its core meaning of slightness or sparseness contrasting with thick vegetation. Arrived in Japan: The character 薄 arrived in Japan during the early cultural exchanges with China, likely between the 5th-7th centuries CE along with other Chinese characters and the writing system. It was adopted into Japanese as 'usu(i)' for the 'thin/light' meaning and 'haku' in on'yomi readings, appearing in early Japanese texts like the Man'yōshū (8th century) poetry anthology.