porridge
麮 centers on a soft, boiled grain dish: porridge made from wheat or barley.
麮 combines 麥 (wheat) and 去, which likely contributes the sound. The character originally referred to a wheat-based porridge.
The left side 麥 is wheat, and the right side 去 looks like a lid being lifted off a pot. Imagine lifting the lid off a pot of wheat porridge.
For キョ, imagine a giant pot of porridge so big it casts a huge shadow: 'kyo' sounds like the start of 'kyo-dai' (huge), and the shadow covers everything.