Trans-act means to carry out or conduct something, often with another person or organization. However, there are several antonyms for trans-act that denote the opposite action. The first antonym is to withdraw or disengage, as in ending a business relationship. The second antonym is to neglect or ignore, indicating a lack of action or involvement. The third antonym is to hinder or impede, indicating an obstruction or barrier. Finally, the fourth antonym is to sabotage or undercut, indicating a deliberate attempt to undermine the success of a transaction. In contrast to trans-act, these antonyms suggest a lack of cooperation, engagement, or commitment.