whip·ple·tree /ˈhwɪpəl(ˌ)tri, ˈwɪ-/
 馬車前端用以系曳繩的橫木


 Whip·ple·tree n.
 1. The pivoted or swinging bar to which the traces, or tugs, of a harness are fastened, and by which a carriage, a plow, or other implement or vehicle, is drawn; a whiffletree; a swingletree; a singletree.  See Singletree.
    [People] cut their own whippletree in the woodlot.   --Emerson.
 2. Bot. The cornel tree.

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 whippletree
      n : a crossbar that is attached to the traces of a draft horse
          and to the vehicle or implement that the horse is pulling
          [syn: whiffletree, swingletree]