Definition of undermine
- to weaken, damage, sabotage, or gradually reduce the effectiveness, confidence, authority, or stability of something
Usage examples of undermine
The fake reviews were meant to undermine the competitor's reputation and make customers distrust its products.
Constant interruptions can undermine a speaker's confidence by making it harder to finish a thought.
Ignoring the safety rules may undermine the entire project because one accident could stop the work for weeks.