whippletrees meaning

Meaning of whippletrees

What is the full meaning of whippletrees

WHIPPLETREE, the crosspiece of a carriage, plough, etc., which is made so as to swing on a pivot and to which the traces of a harnessed animal are fixed, also SINGLETREE, SWINGLETREE, SWINGTREE, WHIFFLETREE [n]

Example of the word whippletrees placed on a Scrabble board.