When it comes to the antonyms for "taking the reins," there are a few options. One of the most direct antonyms is "letting go," which implies surrendering control rather than grasping it tightly. Another option would be "relinquishing power," which has a similar meaning. "Passivity" could also be considered an antonym, as it suggests a lack of assertiveness or involvement. Other antonyms might include "abdication," "yielding," or "capitulation." Ultimately, the antonym for "taking the reins" will depend on the context in which the phrase is being used, as well as the specific shades of meaning that are most relevant in that particular situation.