succussion

Succussion refers to the act of shaking something vigorously, often repeatedly and with purpose. While "shaking" is the broad everyday word, succussion is more technical and is used especially in medical, scientific, and historical contexts.

Historically, physicians used succussion as a diagnostic method, sometimes called "Hippocratic succussion." They would shake a patient and listen for a "succussion splash," the sound of fluid moving within a body cavity such as the chest or stomach. Modern imaging has mostly replaced this practice, but the term still appears in medical language.

Today, succussion is also widely associated with homeopathy. In that setting, a substance is diluted and then "succussed," meaning that the liquid is shaken forcefully, often by striking it against a firm but slightly elastic surface. In homeopathic practice, this shaking is treated as an important part of preparation.

Outside those settings, succussion can describe forceful jolting or repeated shaking more generally, though this use is less common. The word comes from the Latin succutere, which points to a strong upward or upward-from-below shaking motion. Whether it refers to an old diagnostic technique, the preparation of a liquid, or another deliberate jarring movement, succussion suggests more than a casual shake: it is forceful, purposeful, and distinct.