The phrase "hold the reins" is often used figuratively to mean taking control or leading a situation. Some antonyms for this phrase could include letting go, relinquishing control, or stepping back. In situations where one may need to delegate tasks or trust someone else's judgement, holding the reins may not be necessary or even beneficial. Additionally, in cases where one is overwhelmed or overburdened, it may be wise to let someone else take charge. Knowing when to let go of the reins can be a valuable skill in personal and professional relationships, allowing for collaboration and growth.