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coupling rein

noun
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Definition of coupling rein

: the short rein that runs from the inner side of the bridle of one horse of a pair to the draft rein of the other horse

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“Coupling rein.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/coupling%20rein. Accessed 13 December 2019.

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