Stump broke
In the rural southern US, some refer to farm animals that are trained to endure that kind of abuse as "stump broke". No personal experience here, but that's what I've heard from some of my hillbilly cousins.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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