...Itsdocility and intelligence are employed to undermine its health; and itswillingness to learn and to obey is converted into a reason for destroyingits constitution... 
Dinks, Mayhew, and Hutchinson 「The Dog」
...These fluke-wormsundoubtedly aggravate the disease, and perpetuate a state ofirritability and disorganization, which must necessarily undermine thestrength of any animal...
Robert Jennings 「Sheep, Swine, and Poultry」
...The Water-rats, or Voles, eat fishes, frogs, and toads, besides otherfood, and do infinite mischief to banks and dams, which they undermine...
R. Lee 「Anecdotes of the Habits and Instinct of Animals」
...But I kept him in the weather bureau right along, to undermine his reputation...
Mark Twain (Samuel Clemens) 「A Connecticut Yankee in King Arthur’s Court, Complete」
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