floating in air, drifting with wind
颻 centers on light, airy movement: something floating in the air or drifting gently with the wind.
颻 combines 風 (wind) with 䍃, which likely contributes the sound. The character expresses the idea of something carried or moved by the wind.
The wind radical 風 on the right suggests movement through air, while the left side 䍃 looks like a vessel or object being lifted. Picture a light object caught by the wind, floating and drifting along.
For ヨウ, imagine a yo-yo floating in the air, drifting with the wind: yo-yo -> ヨウ, and the wind carries it gently.
—