Tagging on refers to the act of adding something extra to a conversation or event, often without any prior agreement. However, there are many antonyms for tagging on which can be used to describe different actions. For example, instead of tagging on, one may opt to opt out, which refers to the act of declining to participate in something. Alternatively, one could rather separate themselves from the topic or event. Disengage can also be used to describe the act of removing oneself from a conversation or scenario. Other antonyms for tagging on include resisting, refraining, or disavowing, which all imply a lack of engagement or connection with the original topic or event.