Antonyms for the phrase "bumped heads" might include "collaborated smoothly", "synchronized efforts", or "worked together seamlessly". These antonyms suggest a harmonious and successful joint effort rather than a misunderstanding or conflict. Other antonyms could include "coordinated effectively", "communicated openly", or "converged on a shared goal". Overall, these antonyms emphasize the importance of effective communication and collaboration in achieving a common purpose, and suggest a sense of mutual understanding and respect between individuals or groups. By focusing on these positive aspects of teamwork, we can guide our interactions towards a more productive and harmonious outcome.