...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」
...For a character such as this to meetwith harsh treatment, much less cruelty,was, if not to ruin it completely, at leastto undermine all confidence...
Major Gambier-Parry 「'Murphy'」
...At seed-time their depredations are yet more serious, as they nowcome in not simply for a share of the produce, but undermine thevery foundations of the future crop...
Rev. C. A. Johns 「British Birds in their Haunts」
...This would undermine the Church...
Mark Twain (Samuel Clemens) 「A Connecticut Yankee in King Arthur’s Court, Complete」
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