Webster's Revised Unabridged Dictionary (1913 + 1828)
result(s) from the 1913
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.
A vast rock undermined from one end to the other, and a highway running through it.
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.
He should be warned who are like to undermine him.