A worker who cares for or manages hacks (hired horses and carriages); a stableman or person who maintains public transportation animals.
From hack (a horse for hire, from hackney) + -y (diminutive or descriptive) + mal (possibly from an obscure term for a stable worker or handler). This is an archaic or rare English term from the era of horse-drawn transportation.
A 'hackeymal' was basically an invisible worker in the busy streets of 18th-century cities—they cleaned stables, groomed exhausted horses, and kept the public taxi system running, but history largely forgot them!
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