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doubletree

[duhb-uh l-tree]
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noun
  1. a pivoted bar with a whiffletree attached to each end, used in harnessing two horses abreast.
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Origin of doubletree

1840–50, Americanism; modeled on singletree
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for doubletree

doubletree

noun
  1. 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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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012