†b.spec.to twist a horse: see quot. 1728. Obsolete.
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the world > food and drink > farming > animal husbandry > keeping or management of horses > [verb (transitive)] > breed horses > castrate
to twist a horse1728
harrow1753
twitch1798
1728 E. ChambersCycl. (at cited word) To Twist a Horse, is violently to wring or twist his Testicles twice about, which causes them to dry up, and deprives them of Nourishment.