A reversal or backward movement of the normal wave-like muscular contractions in the digestive tract, moving material toward the mouth instead of downward.
From 'anti-' (against) and 'peristalsis' (from Greek 'peri-,' around, and 'stallein,' to place). The term describes the opposite of normal digestive movement, emerging from 19th-century physiology.
When your intestines experience antiperistalsis, your gut literally goes into reverse—it's the biological equivalent of a traffic jam flowing backward, and it's what causes vomiting and regurgitation.
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