...I am not the one to undermine the propriety of Senor Don Quixote, for it strikes me that among his many virtues the one that is pre-eminent is that of modesty... 
Miguel de Cervantes 「The History of Don Quixote, Volume II., Complete」
... Thus maypeace and prosperity undermine the safety of the most primitivecommunity even as it does that of the most cultured...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
...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」
...Of course experience, in some ways,tended to undermine confidence...
Major Gambier-Parry 「'Murphy'」
...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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