Xu Collection, Middle Volume. Radical: Leather (gé). Character: Jin. Kangxi dictionary strokes: 13. Page 1385, Entry 18.
Tang Dynasty Rhymes (Tangyun): Pronounced jin. Collected Rhymes (Jiyun) and Rhymes Compilation (Yunhui): Pronounced jin.
According to Explaining Graphs and Analyzing Characters (Shuowen): A strap across the chest of a horse. Annotation: Xu Kai stated that Jin means firm, as in restricting the horse's movement.
Zuo Tradition (Zuo Zhuan), Ninth Year of Duke Ding: I follow you like the Jin of the outer horse. Annotation: The Jin is the horse in the middle of the carriage. Commentary: The Jin is the leather strap across the chest. The head of the outer horse faces the chest of the inner horse, and the Jin is on the chest.
Also means to be stingy or tight. Zuo Tradition (Zuo Zhuan), Eleventh Year of Duke Zhuang: Duke of Song mocked him. Annotation: To joke and shame someone is called Jin. Commentary: Fu Qian stated that to shame and dislike someone is called Jin.
Also, from Kongzi Jiayu (Family Sayings of Confucius), Tang Yan chapter: Jin means to take.
Also a surname. Extensive Rhymes (Guangyun): There was a high official named Jin Shang in the State of Chu.