swingletree

[ swing-guh l-tree ]
/ ˈswɪŋ gəlˌtri /

noun Chiefly Midland and Southern U.S.

a whiffletree.

Origin of swingletree

late Middle English word dating back to 1425–75; see origin at swingle1, tree
Also called swiveltree.
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British Dictionary definitions for swingletree

swingletree

/ (ˈswɪŋɡəlˌtriː) /

noun

a crossbar in a horse's harness to which the ends of the traces are attachedAlso called: whippletree, (esp US) whiffletree

Word Origin for swingletree

C15: from swingle + tree (in the sense: a post or bar)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012