A traveler or vagrant, especially one who walks long distances and becomes dusty from travel; someone of low social status.
Compound of 'dusty' and 'foot', likely dating to medieval times when most common people traveled on foot. Historically used somewhat disparagingly for vagrants or lower-class travelers.
Before modern transportation, 'dustyfoot' was how society described peasants and wanderers—the dust on their feet literally marked their social class. Language preserved social hierarchy in unexpected ways.
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