air dry, sun dry
晾 centers on drying something by exposing it to open air or sunlight, without using artificial heat.
晾 combines 日 (sun) with 京, which likely contributes the sound. The character expresses drying in the sun or air.
The sun 日 shines on a tall structure 京, like a drying rack, air-drying clothes in the open.
For リョウ, imagine a row of clothes drying in the sun: row -> リョウ, and the sun 日 dries them all.