cleaning dirt or sand out of the digestive system
Refers to the process of removing accumulated sand or dirt from the digestive tract, often in the context of animals or traditional health practices.
Birds swallow small stones to clean sand out of their digestive system.
Compound of 砂 (suna, 'sand') and 下ろし (oroshi, 'dropping' or 'removing'), literally 'sand removal'. The exact historical derivation is uncertain.