noun
also swee·ney ˈswēnē, -ni ; or swin·ney ˈswinē, -ni
( -es )
Etymology: by folk etymology, from Pennsylvania German schwinne, from schwinne to waste away, vanish, from Old High German swintan — more at swindle
: an atrophy of the shoulder muscles of a horse ; broadly : any muscular atrophy of a horse