Doubletree

noun

Definitions

Noun
  1. 1
    a device that connects two horses to a wagon or other implement. The tugs of a harness are connected to a singletree, two of which are connected to a doubletree, which, in turn, is connected to the implement.
  2. 2
    a crossbar on a wagon or carriage to which two whiffletrees are attached in order to harness two horses abreast wordnet

Etymology

From double + tree.

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