1. To gradually weaken or damage someone's or something's power, authority, or superior position
The new competitor's aggressive marketing strategy began to undermine the company's dominance in the market.
A estratégia agressiva de marketing do novo concorrente começou a minar a dominância da empresa no mercado.
2. To reduce or diminish the control or influence that someone or something has over others
Internal conflicts undermined the leader's dominance within the organization.
Conflitos internos minaram o domínio do líder dentro da organização.