(For s.t.) to be wrinkled; crumpled; (for a body joint) to be bent; (for muscles) to be stiff [all these take mag-]; (for a joint) to bend [pa-]; (for a knee, finger or elbow joint) to move freely back and forth [mag--redup].
My pants are wrinkled because of my wife's negligence.
Why won't your arm move freely (at the elbow joint)?
My muscles (lit. veins) are stiff if I don't play basketball.
pa--un/-un/-an, pag--redup--un/-redup--an
To bend an arm, leg, or finger joint; to bend a joint back and forth repeatedly.
Why aren't you able to bend your arm?
Bend your arm back and forth so the numbness will leave.