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noun
North AmericanA crossbar in front of a wagon with a swingletree at each end, enabling two horses to be harnessed.
‘The doubletree on the wagon could be adjusted to allow one horse to pull more.’- ‘The wheel horses pull on the doubletree against this hammerpin running through the wagon-tonque.’
Origin
Mid 19th century from double, on the pattern of singletree.
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