The English language is full of synonyms, and the phrase "be ashamed" is no exception. One synonym for this expression is "feel embarrassed," which suggests that the person feels uncomfortable and self-conscious about their actions or behavior. Another synonym is "hang one's head in shame," which means the person feels guilty and ashamed of what they have done. "Regret" is another synonym for "be ashamed," which implies a feeling of remorse or sorrow for what one has done. "Feel guilty" and "feel remorseful" are also similar expressions. Whatever synonym one chooses, the key idea is that the person feels accountable for something they have done and is suffering the emotional consequences.