The phrase "washed one's hands of" means someone's decision to refuse to take responsibility for something or disassociate themselves from it. Antonyms, or words that have opposite meanings to this phrase, include "accepting responsibility," "taking ownership," "embracing," and "getting involved." Some other possible antonyms that could be used in the same context include "staying engaged," "taking an interest," "taking control," and "showing commitment." Using any of these words would convey a sense of willingness to take on tasks or problems, rather than shirking responsibility or attempting to distance oneself from them.