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

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.

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

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

Undermine or Undermining can refer to: The military practice of mining a fortification UnderMine, a roguelike indie video game Undermine (Transformers), a Transformers character Undermine …

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 …

Dec 14, 2025 · undermine (third-person singular simple present undermines, present participle undermining, simple past and past participle undermined) To dig underneath (something), to make a …

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.