General Usage:
* The constant criticism undermined her confidence.
* The new policy undermined the company's morale.
* The scandal undermined the politician's credibility.
More Specific Examples:
* The recent economic downturn has undermined the government's popularity.
* The constant noise from the construction site undermined the peace of the neighborhood.
* The lack of communication undermined the team's ability to succeed.
Figurative Usage:
* The earthquake undermined the foundations of the building.
* The lack of support from his family undermined his resolve.
The meaning of "undermined" depends on the context, but generally refers to weakening, damaging, or destroying something, whether physically, emotionally, or in terms of its validity or effectiveness.