a footboard along the side of a vehicle, esp an early motorcar
WordReference Random House Unabridged Dictionary of American English © 2025
run′ning board′,
- Automotive, Transporta small ledge, step, or footboard, formerly beneath the doors of an automobile, to assist passengers entering or leaving the car.
- 1810–20, in sense "platform from which a large pole boat is poled,'' American.
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