From Longman Dictionary of Contemporary Englishwitherswith‧ers /ˈwɪðəz $ -ərz/ noun [plural] HBAthe highest part of a horse’s back, above its shoulders
Examples from the Corpus
withers• The metal survives whilst the flesh withers.• Distance from withers to elbow and elbow to ground is equal.• The country was bracken-clothed dunes, the plants so tall that they came over the horse's withers in places.• The last word in lace and satin withers like a bunch of flowers.• The chest depth should be neither more, nor very much less, than 50 percent of the height of the withers.• Check that the saddle fits correctly and is neither too low on the withers or spine.Origin withers (1500-1600) Probably from wither- “against”, from Old English 