The term "break silence" generally refers to the act of speaking up or making noise after a period of quiet. Antonyms of this phrase might include "maintain silence," "stay quiet," or "keep mum." These phrases convey a sense of reticence or reluctance to speak, rather than an eagerness to open up. Other antonyms might include "ignore," "overlook," or "disregard," which suggest a lack of response or attention to a situation that might require speaking out. In some contexts, antonyms of "break silence" might also include "conceal" or "suppress," which imply a deliberate effort to keep information or feelings hidden.