To be unable to keep still

Origin

The human body is a canvas for emotion, and sometimes, those emotions demand expression through movement. From the earliest days, children have squirmed with anticipation, adults have paced in anxious thought, and the restless energy of excitement or worry has manifested as an inability to remain motionless. Unlike more metaphorical idioms, this phrase cuts directly to the core of the experience, offering a plain-spoken description of a universally understood physiological and psychological state. It bypasses elaborate imagery, instead presenting a straightforward articulation of a body that simply must move, reflecting a mind that cannot find its calm, a testament to language's power to describe the most fundamental human sensations directly.