The phrase "beats one breast" typically refers to an intense display of grief or repentance. However, there are several antonyms to this phrase that carry different meanings. One opposite could be "shrugs off," which conveys a dismissive or nonchalant attitude towards a situation. Another antonym could be "applauds," which suggests a positive reaction or celebration. "Remains composed" could be another antonym, implying a calm and collected demeanor in the face of adversity. Overall, the antonyms of "beats one breast" encompass a range of emotions and responses, from indifference to joy, but always representing a contrast to the overwhelming sorrow the original phrase conveys.