2. Sound and form. Words come from words, from feathers, and feathers sound. "Feather" means "light floating". "Yan" and "feather" together mean "frivolous words". Original meaning: Speak lightly. Blow soap bubbles. Talk big.
3. Under the guise of "Wu". Very charming. If you don't smell Qi Mu's attack, you still smell the thrush. -"Two Rhymes Hanging in the Road". Another example: Xu Xu (flattering).