3.
N-
to rub lightly; to caress; to stroke; to pet, as in petting a cat.
This stem is often reduplicated.
Rub me, my back is itching.
4.
eh, ni-
to be rubbed lightly; to be stroked; to be petted; to be caressed.
[For] me, just being rubbed on the back immediately really enables me to sleep.
Rubbing me on my back just puts me to sleep.
I was caressed on my head by her.