- a pivoted bar with a whiffletree attached to each end, used in harnessing two horses abreast.
Origin of doubletree
1840–50, Americanism; modeled on singletree
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for doubletree
The doubletree served as a lever on which to mount two singletrees.
Three horses drew the plow, which has three singletrees and one doubletree.
The arms of the tongue are connected by a crossbar, to which the doubletree is pivoted by a hammer bolt.
Across the doubletree behind them hung the limp form of their driver, a great, gaping wound in his head.Castle Craneycrow
George Barr McCutcheon
- 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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012