The phrase "bringing to heel" means to control or discipline someone or something. The antonyms of this phrase would be to release, set free, or allow to wander. These opposites suggest a lack of control or authority over the subject in question. Other antonyms include accepting, accommodating, and appeasing. These words imply a more passive approach to dealing with a situation, rather than forcing someone or something to submit to a set of rules or expectations. While bringing to heel might be necessary in some circumstances, these alternative approaches may be more appropriate in others, depending on the situation and individuals involved.