starting-block

starting block

noun Track.
a device used by runners, especially sprinters, for increasing their speed off the mark, consisting of a metal or wooden frame, usually secured to the ground at both ends, with adjustable, triangular-shaped blocks on each side for bracing the feet.

Origin:
1945–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
starting block
 
n
one of a pair of adjustable devices with pads or blocks against which a sprinter braces his feet in crouch starts

Collins English Dictionary - Complete & Unabridged 10th Edition
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