The phrase "bone contention" does not have any direct antonyms, as it is a specific term used in certain contexts. However, the words "bone" and "contention" both have numerous antonyms that can be used to describe opposite ideas. Antonyms for "bone" might include soft, flexible, malleable, or pliable. Meanwhile, antonyms for "contention" could be agreement, consensus, compromise, or harmony. By using these antonyms, it is possible to convey a completely different meaning from the original phrase, depending on the context in which they are used.