ˈhwifəl(ˌ)trē, -_tri also ˈwi- noun
or whip·ple·tree -ipəl-
Etymology: whiffletree alteration of whippletree, from whipple- (perhaps irregular from whip ) + tree
: the pivoted swinging bar to which the traces of a harness are fastened and by which a vehicle or implement is drawn — called also singletree, swingletree ; compare doubletree
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1 whiffletree
]