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Related to whippletree: whiffletree
n. Upper Northern US
[Perhaps blend of dialectal whippin, whippletree and swingletree.]
(Horse Training, Riding & Manège) another name for swingletree
[C18: apparently from whip]
whif•fle•tree(ˈʰwɪf əlˌtri, ˈwɪf-)
Northern U.S. a crossbar, pivoted at the middle, to which the traces of a harness are fastened for pulling a vehicle or a plow. Also called whippletree , singletree.
[1820–30; variant of whippletree]