What is ying to my yang meaning?

"Yin to my Yang" is a phrase which is often used to describe the opposite or complementary nature of two things. The terms yin and yang originate from Chinese philosophy and are used to describe opposing yet interconnected forces that exist in all things in the universe. Yin is often associated with feminine, passive, mysterious, and dark qualities while yang is often associated with masculine, active, rational, and bright qualities. Therefore, when someone says "you are the yin to my yang," they mean that the other person complements and completes them by bringing balance to their life.