artiodactyl (zoology)

pig trotters

iron hoof (of the oppressor)

horse's hoof; horseshoe; Chinese water chestnut (Eleocharis dulcis or E. congesta)

unrelenting; without stopping to rest

lit. the horse loses its front hooves; fig. sudden failure through miscalculation or inattentiveness

lit. just as humans make mistakes, so can a horse stumble (idiom); fig. everyone makes mistakes; even the best fall down sometimes