yin and yang
Yin and yang (noun) means In Chinese philosophy, the two complementary forces held to make up everything in the universe: yin, the dark, cool, passive, receptive principle, and yang, the bright, warm, active, assertive one, each containing a trace of the other and constantly turning into it. Example: “Traditional Chinese medicine aims to restore the balance of yin and yang in the body.”
How to use yin and yang
Learner’s notesIn plain EnglishTwo opposite forces that balance each other and make a whole.
The philosophical sense is neutral; the figurative "they're the yin and yang of the office" sense is everyday English. The symbol is properly called the taijitu.
Fill the gap
Can you complete this real example?
Traditional Chinese medicine aims to restore the balance of _____ in the body.
Etymology
From Chinese yin, the shaded northern side of a hill, and yang, its sunlit southern side.