重新 (chóng xīn) means 'again, once more' but specifically implies starting over from the beginning or doing something in a new/different way. It differs from 再 (zài), which is a general 'again' for future actions, and from 又 (yòu), which refers to repetition of past or habitual actions. 重 (chóng) is similar but often used as a prefix meaning 're-' (e.g., 重做 'redo').