A person who causes or is responsible for a stampede, or someone skilled at controlling stampeding animals.
Spanish word combining 'estampida' (stampede) with the agent suffix '-ero' (one who does something). This remained primarily a Spanish-language term but appears in English texts about cattle herding.
In the American West, being a good estampedero was a critical skill—these herders had to understand cattle psychology and could sometimes prevent disasters by knowing exactly when and how to break a stampede's momentum.
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