U.S. Also swinn(e)y. [prob. f. G. dial. schweine emaciation, atrophy, schweinen to become emaciated.] Atrophy of the shoulder-muscles in the horse. Also fig. of the stiffness of pride or self-conceit.
1855. H. C. Kimball, in Jrnl. Discourses, II. 158/1. Too many have got the sweeny, and the skins are growing tight on their flesh.
1887. Sci. Amer., 30 July, 72/3. The shrinkage of the muscles of the shoulder, and which is commonly called sweeny, is due to some lameness of the foot or limb.