A staff or pole dragged behind a vehicle or animal to create friction or slow its movement, or used in surveying and mapping.
Compound of 'drag' (to pull) + 'staff' (a pole or rod). This is an older term from surveying and military contexts, where such implements were used to mark terrain or create drag for speed control.
Dragstaffs were crucial surveying tools before GPS—surveyors would drag them to mark distances and create visible paths for military maneuvers. It's a beautiful example of how simple tools become the basis for technical terminology in specialized fields.
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