The phrase "doing a number on" is a slang term that means to trick or harm someone in some way. Antonyms for this phrase include being kind or respectful towards someone, treating them fairly, and showing them empathy. It could also mean complimenting and building someone up, instead of tearing them down. Other antonyms may include honesty, transparency, and sincerity. These antonyms reflect positive values and behaviors that can foster healthy relationships and promote trust and respect. It's important to choose our words and actions carefully and strive to be kind and compassionate towards others, even in challenging situations.