The phrase "knock block off" generally means to physically assault or harm someone else. However, there are a variety of antonyms that could be used in place of this phrase. For example, "show kindness" suggests an entirely different approach to interpersonal relationships, emphasizing compassion and empathy instead of aggression. Alternately, "avoid confrontation" implies a desire to maintain the peace and avoid conflict altogether. Other possible antonyms for "knock block off" could include "resolve differences peacefully," "forgive and forget," or "de-escalate the situation." Each of these phrases highlights a different approach to dealing with conflict that emphasizes communication, understanding, and mutual respect.