The meaning of UNDERMINE is to subvert or weaken insidiously or secretly. How to use undermine in a sentence. Synonym Discussion of Undermine.

UNDERMINED definition: attacked, weakened, or defeated by underhand or seemingly harmless actions or by imperceptible stages. See examples of undermined used in a sentence.

UNDERMINED definition: 1. past simple and past participle of undermine 2. to make someone less confident, less powerful…. Learn more.

Definition of undermine verb in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

If you undermine someone or undermine their position or authority, you make their authority or position less secure, often by indirect methods. She undermined him and destroyed his …

1. To weaken by wearing away a base or foundation: Water has undermined the stone foundations. 2. To weaken, injure, or impair, often by degrees or imperceptibly; sap: Late …

Dec 3, 2025 · The thousands of gallons of water that cascaded onto the railway line below washed away track, ballast and overhead line equipment, and undermined embankments …

to weaken or destroy by degrees: Her health was undermined by the stress of her job. to attack by indirect, secret, or hidden means: looking for ways to undermine her authority.

To undermine literally means to dig a hole underneath something, making it likely to collapse. But we more often use the word to describe sabotage or the act of weakening someone else's efforts.

Criticism just undermines their confidence. A succession of scandals and revelations has undermined the government over the past year. Suddenly she just turned on me and accused …