Undermine v. t. : 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.

Undermine v. t. : 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.

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Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, thesaurus, glossary, english, language, ESL, n-d, transitive verb, 14th century, earth, wash away, supporting material, insidiously, political rivals.

Defination from the web:
undermine from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... or secretly <trying to undermine his political rivals> 4 : to weaken or ruin by degrees. synonyms see weaken. Learn more about "undermine" ...