dry by exposing sun
暵 centers on drying something by exposing it to the sun, like sun-drying laundry or food.
暵 combines 日 (sun) with a phonetic component that likely contributed the sound カン. The exact historical development of the right side is uncertain.
The sun 日 on the left is doing the work: imagine laying something out under a hot sun until it becomes completely dry.
For カン, picture a can of food left open in the sun to dry out: can -> カン, and the sun dries the contents.