When someone shinnies, they climb up or down something using only their hands and legs, like a monkey.
Shinnies are usually fun and a little bit daring, like when you climb a tree.
Examples:
The cat shinnies up the tree to catch the bird.
Can you shinnie down the pole?
She shinnies up the rope to get to the top.
He shinnies up the ladder like a monkey.
I shinnied up the rock wall at the playground.
The raccoon shinnies up the drainpipe to get to the roof.