1. 
   Swingletree
   A swingletree (British Isles) or singletree (North America) is a wooden or metal bar used to balance the pull of a draught horse or other draught animal when pulling a vehicle. It is a kind of whippletree, and the term is also used sometimes for other whippletrees. It is a horizontal bar, attached ...
   Found op http://en.wikipedia.org/wiki/Swingletree
   
   
2. 
   Swingletree
   Swin'gle·tree` noun [ So named in allusion to its swinging . See Swingle , intransitive verb , and confer Swingtree .] A whiffletree, or whippletree. See Singletree .
   Found op http://www.encyclo.co.uk/webster/S/259
   
   
3. 
   Swingletree
   • (v. i.) A whiffletree, or whippletree. See Singletree.
   Found op http://thinkexist.com/dictionary/meaning/swingletree/
   
   
4. 
   swingletree
   crossbar pivoted in the middle, to which the traces are attached in a horse-drawn cart or plough.
   Found op http://www2.shu.ac.uk/sfca/glossary.cfm
   
   
5. 
   swingletree
   1) Crossbar 2) Whiffletree 3) Whippletree
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/swingletree/1
   
   

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