Moving upward by gripping with the hands and legs, like a monkey.
Shinning can be a fun way to climb things, like trees or poles.
Examples:
The boy is shinning up the tree.
She is shinning down the pole.
He is shinning up the wall.
The cat is shinning up the fence.
I saw a monkey shinning up the tree.
Shinning up the tree is easy for the monkey.