expression, godan verb (-ru)
twist one's body; writhe; turn in one's seat
Describes twisting or contorting the body, often due to pain, discomfort, or strong emotion. Can also refer to turning around while seated.
彼は痛みで身をよじった。
He writhed in pain.
子供は退屈で椅子の上で身
The child was twisting around in his chair out of boredom.