Antonyms for "giving piece ones mind" include phrases such as keeping quiet, holding back, staying silent, and biting one's tongue. These antonyms refer to the act of refraining from expressing one's thoughts or feelings, rather than openly sharing them with others. Other antonyms may include phrases such as bottling up, repressing, or suppressing one's thoughts and emotions, which can be detrimental to one's mental and emotional well-being. In contrast, being able to express oneself openly and honestly can lead to constructive communication, deeper understanding, and better personal relationships.