The phrase "rang in" is a commonly used idiom that generally refers to welcoming or celebrating a new event, usually the beginning of a new year. However, if one were to look for antonyms for this phrase, they might come across words such as "dismissed," "ignored," "neglected," "overlooked," or "failed to acknowledge." These words can connote a sense of disinterest, disapproval, or even hostility towards the subject matter. Therefore, the antonyms of "rang in" depict a lack of eagerness in celebrating an event or show a disregard for its importance.