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Definition of doubletree in English:

doubletree

noun

North American

  • A 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.’

Pronunciation

doubletree

/ˈdəbəlˌtrē/ /ˈdəbəlˌtri/

Origin

Mid 19th century from double, on the pattern of singletree.