: a support or reinforcement (as of board) for the toes or at the base of something
: such as
a
: the sloping boards in the floor of an automotive vehicle in front of the forward seat
b
: a curved piece of wood fastened to the ground at the front of the circle used for shot putting, throwing the weight, or similar contests to prevent overstepping
c
: a low border (as about a staging) especially to prevent dropping of tools or other objects
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Merriam-Webster unabridged
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