Antonyms for busting in include knocking, waiting, respecting boundaries, and seeking permission. Knocking refers to the polite act of announcing one's presence and waiting for a response before entering a space. Waiting means being patient and allowing the occupants of a space to finish their activities before entering. Respecting boundaries means recognizing and honoring personal space and boundaries. Seeking permission involves asking for approval before entering a space or engaging in an activity. In summary, antonyms for busting in involve being patient, polite, and respectful of personal boundaries and space, rather than forcefully entering or interrupting.