The antonyms for the term "makes taut" are "loosens," "relaxes," and "slackens." When something is made taut, it is stretched or tightened. The opposite of this would be to loosen or relax the object, allowing it to become more flexible or less tense. For instance, if a rope is made taut, it means it is stretched tightly. On the other hand, if the rope is slackened, it means it is made loose or relaxed. Similarly, if an individual's muscles are taut, it means they are strained and tight. In contrast, if they are relaxed, it means they are free of tension and stress.