保重 bǎozhòng to take care of oneself

怎么记住“保重”: 保 to protect + 重 heavy = to take care of oneself.

汉字

To take care of one's health - used almost exclusively as a parting well-wish: 你多保重 (nǐ duō bǎozhòng) take good care of yourself.
A warm, slightly formal farewell, especially when parting for a long time or when someone is unwell.
Not for daily 'be careful' (that's 小心); 保重 is specifically about tending your own wellbeing over time.