- 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