to make large twisting movements with the body

The pain was so unbearable that he was writhing in agony. 疼痛实在是难以忍受，他痛苦地扭动着身体。

She was writhing around/about on the ground. 她在地上打滚。

to experience a very difficult or unpleasant situation or emotion, such as extreme embarrassment

He and four other senators were writhing in the glare of unfavourable publicity. 他和其他4位参议员因负面曝光而十分难堪。