UNDERMINES
Verb
undermines
Third-person singular simple present indicative form of undermine
Source: Wiktionary
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.
A vast rock undermined from one end to the other, and a highway
running through it. Addison.
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. Locke.
Source: Webster’s Unabridged Dictionary 1913 Edition