double tree


a pivoted bar with a whiffletree attached to each end, used in harnessing two horses abreast.

1840–50, Americanism; modeled on singletree Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
doubletree (ˈdʌbəlˌtriː)
a horizontal pivoted bar on a vehicle to the ends of which swingletrees are attached for harnessing two horses side by side

Collins English Dictionary - Complete & Unabridged 10th Edition
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