Definition of doubletree in English:

doubletree

Syllabification: dou·ble·tree
Pronunciation: /ˈdəbəlˌtrē
 
/

noun

North American
  • A crossbar in front of a wagon with a swingletree at each end, enabling two horses to be harnessed.
    More example sentences
    • 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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