Gainsay

Is the damaging of someones word by disproving what someone is saying. The person you gainsay loses power whilst you gain some.<ref>“It’s really only gainsaying if you tell a lie and someone calls you out on it,” Nicolette said. “They get a bit of the power the other person lost, for doing the spirit’s share of the judgment.”-Excerpt from Leaving a Mark 4.5</ref>

Gainsaying someone opens the way to forswearing someone.