单词	whiffletree
释义	whiffletree /ˈwɪf(ə)ltriː / noun North American A swingletree.The invention of the horse shoe, the whiffletree, and the spring carriage made travel easier.... I had to get out and let the whiffletrees loose, then the team managed to get out on solid ground. This works something like a hollow auger; it is used for cutting tenons on poles, shafts, whiffletrees, etc. Origin Mid 19th century: variant of whippletree.
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