ppl. a.
1580. Blundevil, Art of Riding, II. x. 19 b. To say the truth, wearines and lack of breath, may cause anie horse, be he neuer so well broken, to do the same.
1728. Mandeville, Fab. Bees (1733), II. 316. All horses are ungovernable, that are not well-broken.
1857. Putnams Monthly Mag., Feb., 173/1. Though his stud was not numerous or choice, it may be said to have been well broken.
1874. Kennel Club Stud Bk., 147. A brace of remarkably well-broken pointers.