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starting block

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noun Track.
  1. 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.
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Origin of starting block

First recorded in 1945–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for starting block

starting block

noun
  1. one of a pair of adjustable devices with pads or blocks against which a sprinter braces his feet in crouch starts
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012