The phrase "making sick" implies causing harm or discomfort to someone's health. Antonyms for this phrase could include "healing" or "improving," suggesting actions that lead to better health and wellbeing. Other related antonyms might include "soothing," "comforting," or "calming," which imply actions that have a therapeutic or relaxing effect. Alternately, antonyms could focus on actions that prevent illness or injury, such as "preventing," "protecting," or "shielding." In all cases, the antonyms for "making sick" suggest actions and behaviors that promote health, safety, and well-being.