UNDERMINE definition: to injure or destroy by insidious activity or imperceptible stages, sometimes tending toward a sudden dramatic effect. See examples of undermine used in a sentence.

UNDERMINE definition: 1. to make someone less confident, less powerful, or less likely to succeed, or to make something…. Learn more.

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

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 hours can undermine one's …

If you undermine something such as a feeling or a system, you make it less strong or less secure than it was before, often by a gradual process or by repeated efforts.

un•der•mine /ˌʌndɚˈmaɪn/ v. [~ + object], -mined, -min•ing. 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 …

To undermine means to damage or weaken someone's confidence, trust, or authority. It can also refer to the act of digging or making a hole underneath something, causing it to become less stable.

Jan 20, 2026 · Verb undermine (third-person singular simple present undermines, present participle undermining, simple past and past participle undermined) To dig underneath (something), to make a …

Undermine definition: To weaken by wearing away a base or foundation.

undermine definition: make authority less secure indirectly. Check meanings, examples, usage tips, pronunciation, domains, and related words. Discover expressions like "undermine someone's …