The phrase "hung something on" means to blame or accuse someone for something. Some antonyms for this phrase could be to defend, excuse, absolve, acquit, or exonerate someone from the accusations. Other antonyms could be to trust, believe, or have faith in the person's innocence. Essentially, any word or phrase that contradicts the act of blaming or accusing someone can be considered an antonym for "hung something on." It's important to consider the context in which this phrase is used and to choose the appropriate antonym accordingly.