The action of fitting or fastening a crupper onto a horse's saddle; equipping a horse with a crupper.
From crupper + -ing (gerund/present participle suffix). Converts the noun into a process or action, following productive English patterns.
Cruppering was once a necessary daily task for stable workers, but this vocabulary has faded as horse culture declined—many old equestrian terms are now relics understood only by historians and Western enthusiasts!
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