prolapse
noun [ C ] medical specialized uk/ˈprəʊ.læps/ us/ˈproʊ.læps/
（器官的）脱垂，下垂，脱出
a medical condition in which an organ has moved down out of its usual position
a rectal prolapse/a prolapse of the rectum 直肠脱垂，脱肛
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