Answer:
I believe that the phrase "my world lost its color" means that whatever brought excitement or happiness into your world is now gone. The word color, I believe, is meant to mean "Joy". When someone says that there world has lost its color, there trying to say that they feel as though there is something missing that once made there world happy and it is now not.
Explanation:
Its LINKIN because an action is doing something to achieve an aim
