1. to weaken or damage something gradually or secretly
Usage: third person singular present tense of ‘undermine’
2. to dig or wear away the base or foundation of something
Usage: literal sense; third person singular present tense of ‘undermine’

Examples

• His constant criticism undermines her confidence.
• The scandal undermines public trust in the government.
• Poor communication undermines team effectiveness.
• The river slowly undermines the cliff face.
• Lack of sleep undermines your immune system.
• The leak undermines the foundation of the building.
• Gossip undermines workplace morale.