When something skeletonizes something else, it means it removes all the flesh or outer parts, leaving only the bones or the basic structure.
Skeletonizing something is usually a little scary because it means taking away everything except the most basic parts.
Examples:
The vulture skeletonizes the dead animal.
The artist skeletonizes the leaves to show only the veins.
The bug skeletonizes the leaf, leaving only the frame.
The wind skeletonizes the umbrella, leaving only the metal parts.
The machine skeletonizes the car, leaving only the frame and wheels.
The monster skeletonizes the toy, leaving only the hard parts.