The phrase "stewing over" suggests being preoccupied or overly concerned about something. Antonyms for this term would be words or phrases that suggest a sense of calm, detachment, or distraction. Some possible antonyms include "letting go," "moving on," "relaxing," "unwinding," "distracting oneself," or "clearing one's mind." These words are often used to advise someone to stop worrying or obsessing over a particular issue or situation. By encouraging a more relaxed or detached approach, these antonyms can help individuals maintain a more positive perspective and reduce stress levels.