An apple left uneaten in a fruit bowl becomes dry and shrunken causing the skin to crease when you pull your fingers firmly across it. This 'wrinkling' is known as chungabung in the fruit world.
The apples my mother bought me when I moved into my apartment 2 months ago are now chungabung so I'll need to go buy some fresh ones.
Granny's cheeks remind me of chungabung apples.
This chungabung apple feels like a turkey's wattle!