What does doubletree mean?
A doubletree is a crossbar mounted at the front of a horse-drawn wagon, cart, or other farm implement, designed to receive the traces — the straps or chains by which a draft animal pulls. Pivoted at its center, the doubletree allows the horse's pulling force to be transmitted evenly to the vehicle while absorbing the side-to-side movement of the animal's gait; on larger rigs, a longer bar connecting multiple doubletrees is called an evener. The term is chiefly American, with 'whippletree' and 'swingletree' serving as common synonyms elsewhere in the English-speaking world. Though modern machinery has largely displaced horse-drawn equipment, the word survives in rural speech, agricultural history, and descriptions of traditional harnessing. It is a concrete, technical noun: you hitch a horse to the doubletree, grease it, replace it when it cracks, or balance a team upon it. For anyone reading about nineteenth-century farming, wagon trains, or working animals, recognizing the doubletree is key to picturing how power actually flowed from muscle to machine.
nounA pivoted crossbar, usually wooden or metal, attached to the front of a wagon or carriage, to which the traces of a draft horse are fastened.
- A crossbar at the front of a wagon or other vehicle, pivoted in the middle, to which the traces of one or more draft animals are attached.
"The farmer greased the doubletree before hitching the mare to the hay wagon."
"He replaced the cracked doubletree before plowing season began."
"Two horses stood patiently in their traces, the doubletree creaking as they leaned into the load."
Regular plural; used when referring to multiple bars, as on multi-horse teams or across a fleet of wagons.
"The barn was stocked with spare doubletrees for the harvest wagons."
The humble doubletree is why a team of horses pulls smoothly together — without its pivot, every jolt of one animal would yank the whole wagon off course.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of doubletree
The word is transparently a compound of 'double' and 'tree', the latter here preserving an older English sense of 'tree' meaning a beam, pole, or piece of timber rather than a living tree. This timber sense descends from Old English 'trēow' (wood, tree), which also underlies the related notion of firmness found in words like 'trust' and 'truth'. The compound arose in the context of horse-drawn agriculture, likely during the eighteenth or early nineteenth century, distinguishing a bar for two horses ('double') from the single-horse 'singletree'.
Related word forms
How doubletree is actually used
Chiefly North American in usage; British English more often uses 'swingletree' or 'whippletree'. The word belongs mainly to agricultural, historical, and rural contexts, and is now encountered mostly in discussions of traditional farming or horse-drawn transport.
Easily confused with doubletree
Whippletree and doubletree are essentially synonymous terms for the same trace-carrying crossbar, but 'doubletree' specifically denotes a two-horse evener, while 'whippletree' is the more general term for any such bar.