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

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.

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.

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 health. 3. To dig a mine or tunnel beneath. American Heritage® Dictionary of the English Language, Fifth Edition.

to injure or destroy by insidious activity or imperceptible stages, sometimes tending toward a sudden dramatic effect. to attack by indirect, secret, or underhand means; attempt to subvert …

Definition of undermine verb from the Oxford Advanced Learner's Dictionary. undermine something/somebody to make something, especially somebody’s confidence or authority, gradually weaker or less effective. Our confidence in the team has been seriously undermined by their recent defeats. This crisis has undermined his position.

UNDERMINE meaning: to make (someone or something) weaker or less effective usually in a secret or gradual way

UNDERMINE meaning: to make someone less confident or make something weaker: . Learn more.

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