two complementary principles of Chinese philosophy: Yin is negative, dark, and feminine, Yang positive, bright, and masculine. Their interaction is thought to maintain the harmony of the universe and to influence everything within it
Word origin
from Chinese (Peking) yin dark + yang bright
Examples of 'Yin and Yang' in a sentence
Yin and Yang
But Bella and Bea were this perfect little unit --- Yin and Yang, Bill and Ben, Tweedledum and Tweedledee.