- An example of to undermine is digging a space under a walkway for irrigation.
- An example of to undermine is a weak person on a team making the team lose a game.
Undermine is defined as to dig beneath, weaken or injure.
transitive verb-·mined′, -·min′ing
- to dig beneath; excavate ground from under, so as to form a tunnel or mine
- to wear away and weaken the supports of: erosion is undermining the wall
- to injure, weaken, or impair, esp. by subtle, stealthy, or insidious means
transitive verbun·der·mined, un·der·min·ing, un·der·mines
- To weaken by wearing away a base or foundation: Water has undermined the stone foundations.
- To weaken, injure, or impair, often by degrees or imperceptibly; sap: Late hours can undermine one's health.
- To dig a mine or tunnel beneath.
(third-person singular simple present undermines, present participle undermining, simple past and past participle undermined)
From under- +"Ž mine.