You Collection, Lower Volume
Radical: Dashing (chuò)
Character: dun
Kangxi Strokes: 18
Page 1264, Entry 13
According to the Book of Rhymes and Sounds (Jiyun), this is the original form of the character dun.
Book of Changes (Yijing), Hexagram of Withdrawal: The mountain is beneath the heavens; this is the image of withdrawal. The superior person keeps small-minded men at a distance, not through expressions of hatred, but through their own dignified severity.
Book of Documents (Shangshu), Micro-statesman: I do not care to follow the path of withdrawal.
Additionally, according to the Collection of Rhymes (Yunhui), it is the name of a river. There is a Withdrawal River in Yelang County. Further details are provided in the preceding entry for the character dun.