double-tree

doubletree

[duhb-uhl-tree]
noun
a pivoted bar with a whiffletree attached to each end, used in harnessing two horses abreast.

Origin:
1840–50, Americanism; modeled on singletree

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World English Dictionary
doubletree (ˈdʌbəlˌtriː)
 
n
a horizontal pivoted bar on a vehicle to the ends of which swingletrees are attached for harnessing two horses side by side

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