To twist s.t.; wring s.t.; turn w.r.t. a door handle; to set the teeth of a saw.
The -an imp. focuses on twisting s.t. in order to remove s.t. as when wringing out wet clothes. The pa--un imp. focuses on changing the shape of s.t. by twisting (thus causing it to be twisted).
Turn the handle on that door if you want to enter.
My chicken's neck has become twisted by a kingfisher (pecking it).