Chen Collection, Lower Volume Radical: Lack (qiàn) Kangxi strokes: 12 Page 568, Entry 16 Pronounced xu (entering tone) According to the Explaining Graphs and Analyzing Characters (Shuowen Jiezi), it refers to something being blown upward. In the Classic of the Primal Bag (Yuanbao Jing), it describes a flickering or leaping motion. The Commentary states: it describes the appearance of movement. Also, according to the Jade Chapters (Yupian), it means suddenly. In Zhang Heng's Western Capital Rhapsody (Xijing Fu), it says: The spirit mountain is towering, suddenly appearing from behind. The commentary notes that it means suddenly. In Zuo Si's Singing of History (Yongshi Shi), it asks: If one is not a person who climbs dragons and attaches to phoenixes, why suddenly come to travel here? Also, it means going and coming without a fixed pattern. In Zuo Si's Rhapsody on the Capital of Wu (Wudu Fu), it refers to something vague and uncertain. Also, it describes a deep and dark appearance. In Wang Yanshou's Rhapsody on the Hall of Numinous Light (Lu Lingguang Dian Fu), it describes a deep and dark space. Also, it describes a swift and rapid appearance. One source says it is like the appearance of something opening and closing rapidly. In Jiang Yan's Miscellaneous Imitations (Za Ni Shi), it describes something as swift as the cry of a swan. It is commonly written as the variant form (xū). In the poems of Du Fu, it says: The autumn wind swiftly blows through the southern lands. It is also interchangeable with the word for vague or indistinct (hū). In the poems of Han Yu, it describes pointing and drawing with transformations that are vague and indistinct. The commentary notes that this refers to an appearance that is blurry and unclear, which should be the word for vague and indistinct, but uses the character for suddenly (xū) as a loan.