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check·rein | \ ˈchek-ˌrān 
\
\Definition of checkrein
1 : a short rein looped over a hook on the saddle of a harness to prevent a horse from lowering its head
2 : a branch rein connecting the driving rein of one horse of a pair with the bit of the other
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Time Traveler for checkrein
The first known use of checkrein was in 1786
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