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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Starting block is always a great word to know.
So is flibbertigibbet. Does it mean:
a scrap or morsel of food left at a meal.
a chattering or flighty, light-headed person.
Example sentences
With the power turned on, an arc is struck between the electrode and a starting block placed in the mold.
But he lost out in the nationals, perhaps because his car might have been crooked in the starting block.
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