Yin Collection, Lower Volume
Radical: Long stride (yǐn)
Page 352, Entry 28
Pronounced yǐn
Shuowen Jiezi (Explaining Graphs and Analyzing Characters): Long stride means to walk a long distance. Derived from the radical for step (chì), suggesting a stretching motion.
Also pronounced yìn. Means to extend.
Yupian (Jade Chapters): Now written as the character for pull (yǐn).