atrophy of the shoulder muscles of horses
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
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Word origin of 'sweeny'altered (prob. via PaGer schwinne) < Ger dial. schweine, atrophy < schweinen, to atrophy, shrink < OHG suinan, to decrease, akin to ON svina, to disappear < IE base *swi-, to disappear, decrease