"Sinking fish, falling geese, concealing the moon, shaming the flowers"
This phrase describes extraordinary beauty. "Sinking fish" and "falling geese" refer to how a beautiful woman's reflection can make fish sink as they stop swimming to gaze at her, and her grace can astonish flying geese into dropping from the sky. "Concealing the moon" and "shaming the flowers" suggest that the moon hides out of embarrassment and flowers wilt in shame when compared to her beauty.