doubletree

Noun

 * 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.

Translations

 * Bulgarian: ок
 * Finnish: parivaljakon karttu, parivaljakon vetokarttu
 * German: Klippschwengel, Wagenschwengel,
 * Swedish: tvåspann