The phrase "is on one's case" refers to someone who is nagging or criticizing another person excessively. Antonyms for this phrase would include "is supportive," "is understanding," and "is accommodating." These antonyms suggest a person who is helpful and kind, rather than overly critical. Other antonyms might include "gives space," "backs off," or "respects boundaries," indicating a person who allows others to take their own path without pressure or judgment. By using these antonyms, we can create a more positive and respectful environment in our relationships, free from undue pressure and criticism.