Clydesdale n. in running or road-racing sports, a heavyweight classification for (male) participants weighing more than 200 pounds; a runner in that weight class. Also attrib. Editorial Note: The upper limit for the classification can vary. A similar category called Athena is for women weighing more than 155 pounds. Etymological Note: From the breed of large draft horse of the same name, via the Clydesdale Runners Association which lobbied for weight division awards in running sports. (source: Double-Tongued Dictionary)
Further reading
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