undermine


From The Collaborative International Dictionary of English v.0.48:

Undermine \Un`der*mine"\, v. t.
   1. To excavate the earth beneath, or the part of, especially
      for the purpose of causing to fall or be overthrown; to
      form a mine under; to sap; as, to undermine a wall.
      [1913 Webster]

            A vast rock undermined from one end to the other,
            and a highway running through it.     --Addison.
      [1913 Webster]

   2. Fig.: To remove the foundation or support of by
      clandestine means; to ruin in an underhand way; as, to
      undermine reputation; to undermine the constitution of the
      state.
      [1913 Webster]

            He should be warned who are like to undermine him.
                                                  --Locke.
      [1913 Webster]
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