naでるderu
1.

To make gentle contact with a surface using the palm or fingers in a soft, smooth manner, often for comfort or affection, such as stroking a child's head.

2.

To allow a light touch by soft objects or sensations, like a gentle breeze brushing against the skin.

3.

To arrange or style hair using a comb or one’s hands by applying a smooth, careful motion.

4.

To express fondness or affection by lightly touching or caressing, often conveying care and tenderness.

5.

To engage in a soft, rhythmic motion that may involve pressing or hitting lightly, typically in a repetitive manner.

Example:

母はため息をつきながら、高校一年生にもなった息子の頭をがしがしと撫でた。